Additional tests checking for symptoms observed within

  Bug28309 First insert violates unique constraint - was "memory" table empty ?
---
Add missing phony targets


Makefile.am:
  Add execution of the ddl stress tests.
    (modified) test-bt: Short running variant added
    (new) test-ext-stress: Longer running variant
    (modified) test-ext: test-ext-stress added
    (modified) test-fast: Short running variant with MyISAM only added
  ---
  Declare test-ext-jp and test-ext-stress to PHONY make targets.
mysql-test/suite/stress/include/ddl.cln:
  Script for cleanup at execution end
mysql-test/suite/stress/include/ddl.pre:
  Script for general preparations at execution start
mysql-test/suite/stress/include/ddl1.inc:
  ddl stress script
mysql-test/suite/stress/include/ddl2.inc:
  ddl stress script
mysql-test/suite/stress/include/ddl3.inc:
  ddl stress script
mysql-test/suite/stress/include/ddl4.inc:
  ddl stress script
mysql-test/suite/stress/include/ddl5.inc:
  ddl stress script
mysql-test/suite/stress/include/ddl6.inc:
  ddl stress script
mysql-test/suite/stress/include/ddl7.inc:
  ddl stress script
mysql-test/suite/stress/include/ddl8.inc:
  ddl stress script
mysql-test/suite/stress/r/ddl_archive.result:
  File with expected results
mysql-test/suite/stress/r/ddl_csv.result:
  File with expected results
mysql-test/suite/stress/r/ddl_innodb.result:
  File with expected results
mysql-test/suite/stress/r/ddl_memory.result:
  File with expected results
mysql-test/suite/stress/r/ddl_myisam.result:
  File with expected results
mysql-test/suite/stress/r/ddl_ndb.result:
  File with expected results
mysql-test/suite/stress/t/ddl_archive.test:
  Storage engine specific toplevel testscript
mysql-test/suite/stress/t/ddl_csv.test:
  Storage engine specific toplevel testscript
mysql-test/suite/stress/t/ddl_innodb.test:
  Storage engine specific toplevel testscript
mysql-test/suite/stress/t/ddl_memory.test:
  Storage engine specific toplevel testscript
mysql-test/suite/stress/t/ddl_myisam.test:
  Storage engine specific toplevel testscript
mysql-test/suite/stress/t/ddl_ndb.test:
  Storage engine specific toplevel testscript

22 files changed, 3617 insertions, 0 deletions

diff --git a/mysql-test/suite/stress/include/ddl.cln b/mysql-test/suite/stress/include/ddl.cln
new file mode 100644
index 00000000000..7d021a8c912
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl.cln
@@ -0,0 +1,4 @@
+######## include/ddl.cln ########
+disconnect con2;
+DEALLOCATE PREPARE stmt_start;
+DEALLOCATE PREPARE stmt_break;
diff --git a/mysql-test/suite/stress/include/ddl.pre b/mysql-test/suite/stress/include/ddl.pre
new file mode 100644
index 00000000000..52de4a3665b
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl.pre
@@ -0,0 +1,21 @@
+######## include/ddl.pre ########
+# The variable
+#     $runtime   -- rough intended runtime per subtest variant
+# must be set within the routine sourcing this script.
+#
+# Please look for more details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-11 mleich
+#
+SET @@session.sql_mode = 'NO_ENGINE_SUBSTITUTION';
+PREPARE stmt_start FROM "SELECT UNIX_TIMESTAMP() INTO @start";
+--replace_result $runtime <intended_runtime>
+eval SET @runtime = $runtime;
+eval PREPARE stmt_break FROM "SELECT UNIX_TIMESTAMP() - @start > @runtime - 1";
+connect (con2,localhost,root,,);
+connection default;
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
diff --git a/mysql-test/suite/stress/include/ddl1.inc b/mysql-test/suite/stress/include/ddl1.inc
new file mode 100644
index 00000000000..96adadc5af5
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl1.inc
@@ -0,0 +1,277 @@
+######## include/ddl1.inc ######
+#
+# Purpose of include/ddl1.inc - include/ddl8.inc:
+#
+#    Stress storage engines with rapid CREATE/DROP TABLE/INDEX
+#    and following SELECT/INSERT/SHOW etc.
+#
+# The variables
+#     $loop_size -- number of rounds till we look at the clock again
+#     $runtime   -- rough intended runtime per subtest variant
+#                Real runtime without server restarts and comparison is:
+#                   -   >= $runtime
+#                   -   > runtime needed for $loop_size execution loops
+#     $engine_type -- storage engine to be used in CREATE TABLE
+# must be set within the routine sourcing this script.
+#
+# Other stuff which must already exist:
+# - connection con2
+# - stmt_start and stmt_break prepared by the default connection
+#
+# Attention:
+#    The test does suppress the writing of most statements, server error
+#    messages and result sets.
+#    This is needed because their number is usual not deterministic.
+#    The test is partially self checking. That means is prints some
+#    helpful hints into the protocol and aborts if something is wrong.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+############################################################################
+#
+# Some details:
+#
+# 1. Base question of the test:
+#       There was just a create or drop of some object (TABLE/INDEX).
+#
+#       Could it happen that the next statement referring to this
+#       object gets a somehow wrong server response (result set,
+#       error message, warning) because the creation or removal of
+#       the object is in an incomplete state?
+#
+#       Thinkable reasons for incomplete state of creation or removal:
+#       The server performs the creation or removal
+#       - all time incomplete.
+#         Example:
+#            Bug#28309 First insert violates unique constraint
+#                      - was "memory" table empty ?
+#       - asynchronous
+#         In that case the next statement has probably to wait till
+#         completion.
+#
+# 2. Why do we use in some scripts "--error 0,<expected error>" followed
+#    a check of $mysql_errno?
+#
+#    System reactions when running with "--error 0,<expected error>":
+#    - RC=0 --> no error message
+#    - RC=<expected error> --> no error message
+#    - RC not in (0,<expected error>) --> error message + abort of script
+#                                         execution
+#
+#    Requirements and tricky solution for statements which are expected
+#    to fail:
+#    1. RC=<expected error>
+#       - no abort of script execution
+#         --> add "--error <expected error>"
+#       - no error message into the protocol, because the number of
+#         executions is NOT deterministic
+#         --> use "--error 0,<expected error>"
+#    2. RC=0 = failure
+#       - abort of script execution
+#       "--error 0,<expected error>" prevents the automatic abort of
+#       execution. Therefore we do not need to code the abort.
+#       --> Check $mysql_errno and do an explicit abort if $mysql_errno = 0.
+#    3. RC not in (0,<expected error>)
+#       - abort of script execution
+#       "--error 0,<expected error>" causes an automatic abort.
+#
+# 3. We do not check the correctness of the SHOW CREATE TABLE output
+#    in detail. This must be done within other tests.
+#    We only check here that
+#    - same CREATE TABLE/INDEX statements lead to the same
+#    - different CREATE TABLE/INDEX statements lead to different
+#    SHOW CREATE TABLE output
+#    (Applies to ddl4.inc. and ddl8.inc.)
+#
+# 4. It could be assumed that running this test with
+#    - PS-PROTOCOL
+#      There are already subtests using prepared statements contained.
+#    - SP/CURSOR/VIEW-PROTOCOL
+#      These protocol variants transform SELECTs to hopefully much
+#      stressing statement sequencies using SP/CURSOR/VIEW.
+#      The SELECTs within include/ddl*.inc are very simple.
+#    does not increase the coverage.
+#    Therefore we skip runs with these protocols.
+#
+# 5. The test consumes significant runtime when running on a non RAM
+#    based filesystem (run without "--mem").
+#    Therefore we adjust $runtime and $loop_size depending on "--big-test"
+#    option.
+#    $runtime and $loop_size do not influence the expected results.
+#    Rough runtime in seconds reported by mysql-test-run.pl:
+#        (engine_type = MEMORY)
+#    option set    -> $runtime $loop_size  real runtime in seconds
+#                         1        20             68
+#    --mem                1        20             32
+#          --big-test     5       100            200
+#    --mem --big-test     5       100            400
+#    I assume that runs with slow filesystems are as much valuable
+#    as runs with extreme fast filesystems.
+#
+# 6. Hints for analysis of test failures:
+#    1. Look into the protocol and check in which ddl*.inc
+#       script the difference to the expected result occured.
+#    2. Comment the sourcing of all other ddl*.inc scripts
+#       out.
+#    3. Edit the ddl*.inc script where the error occured and
+#       remove all
+#       - "--disable_query_log", "--disable_result_log"
+#       - successful passed subtests.
+#    4. Alternative:
+#       Have a look into VARDIR/master-data/mysql/general_log.CSV
+#       and construct a new testcase from that.
+#    5. If the problem is not deterministic, please try the following
+#       - increase $runtime (important), $loop_size (most probably
+#         less important) within the "t/ddl_<engine>.test" and
+#         maybe the "--testcase-timeout" assigned to mysqltest-run.pl
+#       - vary the I/O performance of the testing machine by using
+#         a RAM or disk based filesystem for VARDIR
+#
+
+
+#----------------------------------------------------------------------
+# Settings for Subtest 1 variants
+# Scenario: CREATE with UNIQUE KEY/INSERT/DROP TABLE like in Bug#28309
+let $create_table= CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = $engine_type;
+let $insert_into=  INSERT INTO t1 VALUES (1,1), (2,2), (3,3);
+let $drop_table=   DROP TABLE t1;
+#----------------------------------------------------------------------
+
+#
+--echo # Subtest 1A (one connection, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    default:    $insert_into
+--echo #    default:    $drop_table
+--disable_query_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table;
+      eval $insert_into;
+      eval $drop_table;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_query_log
+#
+--echo # Subtest 1B (one connection, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    default:    $insert_into
+--echo #    default:    $drop_table
+--disable_query_log
+connection default;
+eval PREPARE create_table FROM "$create_table";
+EXECUTE create_table;
+eval PREPARE insert_into FROM "$insert_into";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE drop_table;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table;
+      EXECUTE insert_into;
+      EXECUTE drop_table;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table;
+DEALLOCATE PREPARE insert_into;
+DEALLOCATE PREPARE drop_table;
+--enable_query_log
+#
+--echo # Subtest 1C (two connections, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    con2:       $insert_into
+--echo #    con2:       $drop_table
+--disable_query_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table;
+      connection con2;
+      eval $insert_into;
+      eval $drop_table;
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_query_log
+#
+--echo # Subtest 1D (two connections, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    con2:       $insert_into
+--echo #    con2:       $drop_table
+--disable_query_log
+connection default;
+eval PREPARE create_table FROM "$create_table";
+EXECUTE create_table;
+connection con2;
+eval PREPARE insert_into FROM "$insert_into";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE drop_table;
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table;
+      connection con2;
+      EXECUTE insert_into;
+      EXECUTE drop_table;
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table;
+connection con2;
+DEALLOCATE PREPARE insert_into;
+DEALLOCATE PREPARE drop_table;
+connection default;
+--enable_query_log
diff --git a/mysql-test/suite/stress/include/ddl2.inc b/mysql-test/suite/stress/include/ddl2.inc
new file mode 100644
index 00000000000..dd2ec0fd804
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl2.inc
@@ -0,0 +1,259 @@
+######## include/ddl2.inc ######
+#
+# Stress the storage engine with rapid CREATE/DROP TABLE/INDEX
+# and following SELECT/INSERT/SHOW etc.
+# Subtest 2 variants (2A - 2D)
+#
+# The variables
+#     $loop_size -- number of rounds till we look at the clock again
+#     $runtime   -- rough intended runtime per subtest variant
+#     $engine_type -- storage engine to be used in CREATE TABLE
+# must be set within the routine sourcing this script.
+#
+# Other stuff which must already exist:
+# - connection con2
+# - stmt_start and stmt_break prepared by the default connection
+#
+# Please look for more details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+
+#----------------------------------------------------------------------
+# Settings for Subtest 2 variants
+# Scenario: CREATE TABLE AS SELECT/SELECT/DROP/SELECT(F)
+let $create_table=  CREATE TABLE t1 ENGINE = $engine_type AS SELECT 1 AS f1;
+let $select_record= SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1;
+let $drop_table=    DROP TABLE t1;
+#----------------------------------------------------------------------
+
+#
+--echo # Subtest 2A (one connection, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    default:    $select_record
+--echo #    default:    $drop_table
+--echo #    default:    $select_record (expect to get ER_NO_SUCH_TABLE)
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table;
+      if (`$select_record`)
+      {
+         --enable_result_log
+         --enable_query_log
+         --echo # Error: Unexpected content within t1.
+         --echo # Expected: 0
+         --echo # Got:
+         eval $select_record;
+         SELECT * FROM t1;
+         --echo # abort
+         exit;
+      }
+      eval $drop_table;
+      --error 0,ER_NO_SUCH_TABLE
+      eval $select_record;
+      if (!$mysql_errno)
+      {
+         --echo # Error: SELECT was successful though we expected ER_NO_SUCH_TABLE
+         --echo # abort
+         exit;
+      }
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 2B (one connection, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    default:    $select_record
+--echo #    default:    $drop_table
+--echo #    default:    $select_record (expect to get ER_NO_SUCH_TABLE)
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_table FROM "$create_table";
+EXECUTE create_table;
+eval PREPARE select_record FROM "$select_record";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE drop_table;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table;
+      if (`EXECUTE select_record`)
+      {
+         --enable_result_log
+         --enable_query_log
+         --echo # Error: Unexpected content within t1.
+         --echo # Expected: 0
+         --echo # Got:
+         EXECUTE select_record;
+         SELECT * FROM t1;
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_table;
+      --error 0,ER_NO_SUCH_TABLE
+      EXECUTE select_record;
+      if (!$mysql_errno)
+      {
+         --echo # Error: SELECT was successful though we expected ER_NO_SUCH_TABLE
+         --echo # abort
+         exit;
+      }
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table;
+DEALLOCATE PREPARE select_record;
+DEALLOCATE PREPARE drop_table;
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 2C (two connections, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    con2:       $select_record
+--echo #    default:    $drop_table
+--echo #    con2:       $select_record (expect to get ER_NO_SUCH_TABLE)
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table;
+      connection con2;
+      if (`$select_record`)
+      {
+         --enable_result_log
+         --enable_query_log
+         --echo # Error: Unexpected content within t1.
+         --echo # Expected: 0
+         --echo # Got:
+         eval $select_record;
+         SELECT * FROM t1;
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $drop_table;
+      connection con2;
+      --error 0,ER_NO_SUCH_TABLE
+      eval $select_record;
+      if (!$mysql_errno)
+      {
+         --echo # Error: SELECT was successful though we expected ER_NO_SUCH_TABLE
+         --echo # abort
+         exit;
+      }
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 2D (two connections, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    con2:       $select_record
+--echo #    default:    $drop_table
+--echo #    con2:       $select_record (expect to get ER_NO_SUCH_TABLE)
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_table FROM "$create_table";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE create_table;
+connection con2;
+eval PREPARE select_record FROM "$select_record";
+connection default;
+EXECUTE drop_table;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table;
+      connection con2;
+      if (`EXECUTE select_record`)
+      {
+         --enable_result_log
+         --enable_query_log
+         --echo # Error: Unexpected content within t1.
+         --echo # Expected: 0
+         --echo # Got:
+         EXECUTE select_record;
+         SELECT * FROM t1;
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE drop_table;
+      connection con2;
+      --error 0,ER_NO_SUCH_TABLE
+      EXECUTE select_record;
+      if (!$mysql_errno)
+      {
+         --echo # Error: SELECT was successful though we expected ER_NO_SUCH_TABLE
+         --echo # abort
+         exit;
+      }
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table;
+DEALLOCATE PREPARE drop_table;
+connection con2;
+DEALLOCATE PREPARE select_record;
+connection default;
+--enable_result_log
+--enable_query_log
diff --git a/mysql-test/suite/stress/include/ddl3.inc b/mysql-test/suite/stress/include/ddl3.inc
new file mode 100644
index 00000000000..aacf09f9428
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl3.inc
@@ -0,0 +1,242 @@
+######## include/ddl3.inc ######
+#
+# Stress the storage engine with rapid CREATE/DROP TABLE/INDEX
+# and following SELECT/INSERT/SHOW etc.
+# Subtest 3 variants (3A - 3D)
+#
+# The variables
+#     $loop_size -- number of rounds till we look at the clock again
+#     $runtime   -- rough intended runtime per subtest variant
+#     $engine_type -- storage engine to be used in CREATE TABLE
+# must be set within the routine sourcing this script.
+#
+# Other stuff which must already exist:
+# - connection con2
+# - stmt_start and stmt_break prepared by the default connection
+#
+# Please look for more details within include/ddl2.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+
+#----------------------------------------------------------------------
+# Settings for Subtest 3 variants
+# Scenario: CREATE TABLE/CREATE TABLE(F)/DROP TABLE/DROP TABLE(F)
+let $create_table=  CREATE TABLE t1 (f1 BIGINT) ENGINE=$engine_type;
+let $drop_table=    DROP TABLE t1;
+#----------------------------------------------------------------------
+
+#
+--echo # Subtest 3A (one connection, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    default:    $create_table (expect to get ER_TABLE_EXISTS_ERROR)
+--echo #    default:    $drop_table
+--echo #    default:    $drop_table (expect to get ER_BAD_TABLE_ERROR)
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table;
+      --error 0,ER_TABLE_EXISTS_ERROR
+      eval $create_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE TABLE was successful though we expected ER_TABLE_EXISTS_ERROR
+         --echo # abort
+         exit;
+      }
+      eval $drop_table;
+      --error 0,ER_BAD_TABLE_ERROR
+      eval $drop_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: DROP TABLE was successful though we expected ER_BAD_TABLE_ERROR)
+         --echo # abort
+         exit;
+      }
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 3B (one connection, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    default:    $create_table (expect to get ER_TABLE_EXISTS_ERROR)
+--echo #    default:    $drop_table
+--echo #    default:    $drop_table (expect to get ER_BAD_TABLE_ERROR)
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_table FROM "$create_table";
+EXECUTE create_table;
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE drop_table;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table;
+      --error 0,ER_TABLE_EXISTS_ERROR
+      EXECUTE create_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE TABLE was successful though we expected ER_TABLE_EXISTS_ERROR
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_table;
+      --error 0,ER_BAD_TABLE_ERROR
+      EXECUTE drop_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: DROP TABLE was successful though we expected ER_BAD_TABLE_ERROR)
+         --echo # abort
+         exit;
+      }
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table;
+DEALLOCATE PREPARE drop_table;
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 3C (two connections, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    con2:       $create_table (expect to get ER_TABLE_EXISTS_ERROR)
+--echo #    default:    $drop_table
+--echo #    con2:       $drop_table (expect to get ER_BAD_TABLE_ERROR)
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table;
+      connection con2;
+      --error 0,ER_TABLE_EXISTS_ERROR
+      eval $create_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE TABLE was successful though we expected ER_TABLE_EXISTS_ERROR
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $drop_table;
+      connection con2;
+      --error 0,ER_BAD_TABLE_ERROR
+      eval $drop_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: DROP TABLE was successful though we expected ER_BAD_TABLE_ERROR)
+         --echo # abort
+         exit;
+      }
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 3D (two connections, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    con2:       $create_table (expect to get ER_TABLE_EXISTS_ERROR)
+--echo #    default:    $drop_table
+--echo #    con2:       $drop_table (expect to get ER_BAD_TABLE_ERROR)
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_table FROM "$create_table";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE create_table;
+connection con2;
+eval PREPARE create_table FROM "$create_table";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE drop_table;
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table;
+      connection con2;
+      --error 0,ER_TABLE_EXISTS_ERROR
+      EXECUTE create_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE TABLE was successful though we expected ER_TABLE_EXISTS_ERROR
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE drop_table;
+      connection con2;
+      --error 0,ER_BAD_TABLE_ERROR
+      EXECUTE drop_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: DROP TABLE was successful though we expected ER_BAD_TABLE_ERROR)
+         --echo # abort
+         exit;
+      }
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table;
+DEALLOCATE PREPARE drop_table;
+connection con2;
+DEALLOCATE PREPARE create_table;
+DEALLOCATE PREPARE drop_table;
+connection default;
+--enable_result_log
+--enable_query_log
diff --git a/mysql-test/suite/stress/include/ddl4.inc b/mysql-test/suite/stress/include/ddl4.inc
new file mode 100644
index 00000000000..10452a453a5
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl4.inc
@@ -0,0 +1,339 @@
+######## include/ddl4.inc ######
+#
+# Stress the storage engine with rapid CREATE/DROP TABLE/INDEX
+# and following SELECT/INSERT/SHOW etc.
+# Subtest 4 variants (4A - 4D)
+#
+# The variables
+#     $loop_size -- number of rounds till we look at the clock again
+#     $runtime   -- rough intended runtime per subtest variant
+#     $engine_type -- storage engine to be used in CREATE TABLE
+# must be set within the routine sourcing this script.
+#
+# Other stuff which must already exist:
+# - connection con2
+# - stmt_start and stmt_break prepared by the default connection
+#
+# Please look for more details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+
+#----------------------------------------------------------------------
+# Settings for Subtest 4 variants
+# Scenario: CREATE TABLE variant1/SHOW/DROP TABLE/SHOW(F)/
+#           CREATE TABLE variant2/SHOW/DROP TABLE
+let $create_table1=  CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=$engine_type;
+let $create_table2=  CREATE TABLE t1 (f1 BIGINT) ENGINE=$engine_type;
+let $show_table=     SHOW CREATE TABLE t1;
+let $drop_table=     DROP TABLE t1;
+#
+eval $create_table1;
+let $cr_value1= INITIALIZED;
+let $cr_value1= query_get_value($show_table, Create Table, 1);
+eval $drop_table;
+eval $create_table2;
+let $cr_value2= INITIALIZED;
+let $cr_value2= query_get_value($show_table, Create Table, 1);
+eval $drop_table;
+if (`SELECT '$cr_value1' = '$cr_value2'`)
+{
+   --echo # Error during generation of prerequisites.
+   --echo # cr_value1 equals cr_value2
+   --echo # cr_value1: $cr_value1
+   --echo # cr_value2: $cr_value2
+   --echo # abort
+   exit;
+}
+#----------------------------------------------------------------------
+
+#
+--echo # Subtest 4A (one connection, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table1
+--echo #    default:    $show_table
+--echo #    default:    $drop_table
+--echo #    default:    $show_table (expect to get ER_NO_SUCH_TABLE)
+--echo #    default:    $create_table2
+--echo #    default:    $show_table
+--echo #    default:    $drop_table
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table1;
+      let $value= INITIALIZED;
+      let $value= query_get_value($show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value1'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value1
+         --echo # abort
+         exit;
+      }
+      eval $drop_table;
+      --error 0,ER_NO_SUCH_TABLE
+      eval $show_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: SHOW CREATE TABLE was successful though we expected ER_NO_SUCH_TABLE)
+         --echo # abort
+         exit;
+      }
+      eval $create_table2;
+      let $value= INITIALIZED;
+      let $value= query_get_value($show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value2'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value2
+         --echo # abort
+         exit;
+      }
+      eval $drop_table;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 4B (one connection, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table1
+--echo #    default:    $show_table
+--echo #    default:    $drop_table
+--echo #    default:    $show_table (expect to get ER_NO_SUCH_TABLE)
+--echo #    default:    $create_table2
+--echo #    default:    $show_table
+--echo #    default:    $drop_table
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_table1 FROM "$create_table1";
+eval PREPARE create_table2 FROM "$create_table2";
+EXECUTE create_table1;
+eval PREPARE show_table FROM "$show_table";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE drop_table;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table1;
+      let $value= INITIALIZED;
+      let $value= query_get_value(EXECUTE show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value1'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value1
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_table;
+      --error 0,ER_NO_SUCH_TABLE
+      EXECUTE show_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: SHOW CREATE TABLE was successful though we expected ER_NO_SUCH_TABLE)
+         --echo # abort
+         exit;
+      }
+      EXECUTE create_table2;
+      let $value= INITIALIZED;
+      let $value= query_get_value(EXECUTE show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value2'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value2
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_table;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table1;
+DEALLOCATE PREPARE create_table2;
+DEALLOCATE PREPARE show_table;
+DEALLOCATE PREPARE drop_table;
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 4C (two connections, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table1
+--echo #    con2:       $show_table
+--echo #    default:    $drop_table
+--echo #    con2:       $show_table (expect to get ER_NO_SUCH_TABLE)
+--echo #    default:    $create_table2
+--echo #    con2:       $show_table
+--echo #    default:    $drop_table
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table1;
+      connection con2;
+      let $value= INITIALIZED;
+      let $value= query_get_value($show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value1'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value1
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $drop_table;
+      connection con2;
+      --error 0,ER_NO_SUCH_TABLE
+      eval $show_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: SHOW CREATE TABLE was successful though we expected ER_NO_SUCH_TABLE)
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $create_table2;
+      connection con2;
+      let $value= INITIALIZED;
+      let $value= query_get_value($show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value2'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value2
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $drop_table;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 4D (two connections, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table1
+--echo #    con2:       $show_table
+--echo #    default:    $drop_table
+--echo #    con2:       $show_table (expect to get ER_NO_SUCH_TABLE)
+--echo #    default:    $create_table2
+--echo #    con2:       $show_table
+--echo #    default:    $drop_table
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_table1 FROM "$create_table1";
+eval PREPARE create_table2 FROM "$create_table2";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE create_table1;
+connection con2;
+eval PREPARE show_table FROM "$show_table";
+connection default;
+EXECUTE drop_table;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table1;
+      connection con2;
+      let $value= INITIALIZED;
+      let $value= query_get_value(EXECUTE show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value1'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value1
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE drop_table;
+      connection con2;
+      --error 0,ER_NO_SUCH_TABLE
+      EXECUTE show_table;
+      if (!$mysql_errno)
+      {
+         --echo # Error: SHOW CREATE TABLE was successful though we expected ER_NO_SUCH_TABLE)
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE create_table2;
+      connection con2;
+      let $value= INITIALIZED;
+      let $value= query_get_value(EXECUTE show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value2'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value2
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE drop_table;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table1;
+DEALLOCATE PREPARE create_table2;
+DEALLOCATE PREPARE drop_table;
+connection con2;
+DEALLOCATE PREPARE show_table;
+connection default;
+--enable_result_log
+--enable_query_log
diff --git a/mysql-test/suite/stress/include/ddl5.inc b/mysql-test/suite/stress/include/ddl5.inc
new file mode 100644
index 00000000000..5a6c2fa0e96
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl5.inc
@@ -0,0 +1,227 @@
+######## include/ddl5.inc ######
+#
+# Stress the storage engine with rapid CREATE/DROP TABLE/INDEX
+# and following SELECT/INSERT/SHOW etc.
+# Subtest 5 variants (5A - 5D)
+#
+# The variables
+#     $loop_size -- number of rounds till we look at the clock again
+#     $runtime   -- rough intended runtime per subtest variant
+#     $engine_type -- storage engine to be used in CREATE TABLE
+# must be set within the routine sourcing this script.
+#
+# Other stuff which must already exist:
+# - connection con2
+# - stmt_start and stmt_break prepared by the default connection
+#
+# Please look for more details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+#----------------------------------------------------------------------
+# Settings for Subtest 5 variants
+# Scenario: CREATE TABLE with AUTOINC/INSERT/SELECT/DROP TABLE
+let $create_table=   CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = $engine_type;
+let $insert_into=    INSERT INTO t1 SET f2 = 9;
+let $select_record=  SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9;
+let $drop_table=     DROP TABLE t1;
+#----------------------------------------------------------------------
+
+#
+--echo # Subtest 5A (one connection, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    default:    $insert_into
+--echo #    default:    $select_record
+--echo #    default:    $drop_table
+--disable_query_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table;
+      eval $insert_into;
+      if (`$select_record`)
+      {
+         --enable_result_log
+         --enable_query_log
+         --echo # Error: Unexpected content within t1.
+         --echo # Expected: 0
+         --echo # Got:
+         eval $select_record;
+         SELECT * FROM t1;
+         --echo # abort
+         exit;
+      }
+      eval $drop_table;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_query_log
+#
+--echo # Subtest 5B (one connection, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    default:    $insert_into
+--echo #    default:    $select_record
+--echo #    default:    $drop_table
+--disable_query_log
+connection default;
+eval PREPARE create_table FROM "$create_table";
+EXECUTE create_table;
+eval PREPARE insert_into FROM "$insert_into";
+eval PREPARE select_record FROM "$select_record";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE drop_table;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table;
+      EXECUTE insert_into;
+      if (`EXECUTE select_record`)
+      {
+         --enable_result_log
+         --enable_query_log
+         --echo # Error: Unexpected content within t1.
+         --echo # Expected: 0
+         --echo # Got:
+         EXECUTE select_record;
+         SELECT * FROM t1;
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_table;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table;
+DEALLOCATE PREPARE insert_into;
+DEALLOCATE PREPARE select_record;
+DEALLOCATE PREPARE drop_table;
+--enable_query_log
+#
+--echo # Subtest 5C (two connections, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    con2:       $insert_into
+--echo #    default:    $select_record
+--echo #    con2:       $drop_table
+--disable_query_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_table;
+      connection con2;
+      eval $insert_into;
+      connection default;
+      if (`$select_record`)
+      {
+         --enable_result_log
+         --enable_query_log
+         --echo # Error: Unexpected content within t1.
+         --echo # Expected: 0
+         --echo # Got:
+         eval $select_record;
+         SELECT * FROM t1;
+         --echo # abort
+         exit;
+      }
+      connection con2;
+      eval $drop_table;
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_query_log
+#
+--echo # Subtest 5D (two connections, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_table
+--echo #    con2:       $insert_into
+--echo #    default:    $select_record
+--echo #    con2:       $drop_table
+--disable_query_log
+connection default;
+eval PREPARE create_table FROM "$create_table";
+EXECUTE create_table;
+eval PREPARE select_record FROM "$select_record";
+connection con2;
+eval PREPARE insert_into FROM "$insert_into";
+eval PREPARE drop_table FROM "$drop_table";
+EXECUTE drop_table;
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_table;
+      connection con2;
+      EXECUTE insert_into;
+      connection default;
+      if (`EXECUTE select_record`)
+      {
+         --enable_result_log
+         --enable_query_log
+         --echo # Error: Unexpected content within t1.
+         --echo # Expected: 0
+         --echo # Got:
+         EXECUTE select_record;
+         SELECT * FROM t1;
+         --echo # abort
+         exit;
+      }
+      connection con2;
+      EXECUTE drop_table;
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_table;
+DEALLOCATE PREPARE select_record;
+connection con2;
+DEALLOCATE PREPARE insert_into;
+DEALLOCATE PREPARE drop_table;
+connection default;
+--enable_query_log
diff --git a/mysql-test/suite/stress/include/ddl6.inc b/mysql-test/suite/stress/include/ddl6.inc
new file mode 100644
index 00000000000..7bbfe300eaa
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl6.inc
@@ -0,0 +1,266 @@
+######## include/ddl6.inc ######
+#
+# Stress the storage engine with rapid CREATE/DROP TABLE/INDEX
+# and following SELECT/INSERT/SHOW etc.
+# Subtest 6 variants (6A - 6D)
+#
+# The variables
+#     $loop_size -- number of rounds till we look at the clock again
+#     $runtime   -- rough intended runtime per subtest variant
+#     $engine_type -- storage engine to be used in CREATE TABLE
+# must be set within the routine sourcing this script.
+#
+# Other stuff which must already exist:
+# - connection con2
+# - stmt_start and stmt_break prepared by the default connection
+#
+# Please look for more details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+
+#----------------------------------------------------------------------
+# Settings for Subtest 6 variants
+# Scenario: CREATE INDEX/CREATE INDEX(F)/DROP INDEX/DROP INDEX(F)
+let $create_index=  CREATE INDEX IDX1 ON t1 (f2);
+let $drop_index=    DROP INDEX IDX1 ON t1;
+eval CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=$engine_type;
+#----------------------------------------------------------------------
+
+
+#
+--echo # Subtest 6A (one connection, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index
+--echo #    default:    $create_index (expect to get ER_DUP_KEYNAME)
+--echo #    default:    $drop_index
+--echo #    default:    $drop_index (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+--echo #    default:    $create_index
+--echo #    default:    $drop_index
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_index;
+      --error 0,ER_DUP_KEYNAME
+      eval $create_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE INDEX was successful though we expected ER_DUP_KEYNAME
+         --echo # abort
+         exit;
+      }
+      eval $drop_index;
+      --error 0,ER_CANT_DROP_FIELD_OR_KEY
+      eval $drop_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: DROP INDEX was successful though we expected ER_CANT_DROP_FIELD_OR_KEY
+         --echo # abort
+         exit;
+      }
+      eval $create_index;
+      eval $drop_index;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 6B (one connection, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index
+--echo #    default:    $create_index (expect to get ER_DUP_KEYNAME)
+--echo #    default:    $drop_index
+--echo #    default:    $drop_index (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+--echo #    default:    $create_index
+--echo #    default:    $drop_index
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_index FROM "$create_index";
+EXECUTE create_index;
+eval PREPARE drop_index FROM "$drop_index";
+EXECUTE drop_index;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_index;
+      --error 0,ER_DUP_KEYNAME
+      EXECUTE create_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE INDEX was successful though we expected ER_DUP_KEYNAME
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_index;
+      --error 0,ER_CANT_DROP_FIELD_OR_KEY
+      EXECUTE drop_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: DROP INDEX was successful though we expected ER_CANT_DROP_FIELD_OR_KEY
+         --echo # abort
+         exit;
+      }
+      EXECUTE create_index;
+      EXECUTE drop_index;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_index;
+DEALLOCATE PREPARE drop_index;
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 6C (two connections, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index
+--echo #    con2:       $create_index (expect to get ER_DUP_KEYNAME)
+--echo #    default:    $drop_index
+--echo #    con2:       $drop_index (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+--echo #    default:    $create_index
+--echo #    con2:       $drop_index
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_index;
+      connection con2;
+      --error 0,ER_DUP_KEYNAME
+      eval $create_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE INDEX was successful though we expected ER_DUP_KEYNAME
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $drop_index;
+      connection con2;
+      --error 0,ER_CANT_DROP_FIELD_OR_KEY
+      eval $drop_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: DROP INDEX was successful though we expected ER_CANT_DROP_FIELD_OR_KEY
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $create_index;
+      connection con2;
+      eval $drop_index;
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 6D (two connections, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index
+--echo #    con2:       $create_index (expect to get ER_DUP_KEYNAME)
+--echo #    default:    $drop_index
+--echo #    con2:       $drop_index (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+--echo #    default:    $create_index
+--echo #    con2:       $drop_index
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_index FROM "$create_index";
+eval PREPARE drop_index FROM "$drop_index";
+EXECUTE create_index;
+connection con2;
+eval PREPARE create_index FROM "$create_index";
+eval PREPARE drop_index FROM "$drop_index";
+EXECUTE drop_index;
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_index;
+      connection con2;
+      --error 0,ER_DUP_KEYNAME
+      EXECUTE create_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE INDEX was successful though we expected ER_DUP_KEYNAME
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE drop_index;
+      connection con2;
+      --error 0,ER_CANT_DROP_FIELD_OR_KEY
+      EXECUTE drop_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: DROP INDEX was successful though we expected ER_CANT_DROP_FIELD_OR_KEY
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE create_index;
+      connection con2;
+      EXECUTE drop_index;
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_index;
+DEALLOCATE PREPARE drop_index;
+connection con2;
+DEALLOCATE PREPARE create_index;
+DEALLOCATE PREPARE drop_index;
+connection default;
+--enable_result_log
+--enable_query_log
+
+DROP TABLE t1;
diff --git a/mysql-test/suite/stress/include/ddl7.inc b/mysql-test/suite/stress/include/ddl7.inc
new file mode 100644
index 00000000000..76ba8066c66
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl7.inc
@@ -0,0 +1,274 @@
+######## include/ddl7.inc ######
+#
+# Stress the storage engine with rapid CREATE/DROP TABLE/INDEX
+# and following SELECT/INSERT/SHOW etc.
+# Subtest 7 variants (7A - 7D)
+#
+# The variables
+#     $loop_size -- number of rounds till we look at the clock again
+#     $runtime   -- rough intended runtime per subtest variant
+#     $engine_type -- storage engine to be used in CREATE TABLE
+# must be set within the routine sourcing this script.
+#
+# Other stuff which must already exist:
+# - connection con2
+# - stmt_start and stmt_break prepared by the default connection
+#
+# Please look for more details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+
+#----------------------------------------------------------------------
+# Settings for Subtest 7 variants
+# Scenario: CREATE INDEX/INSERT(F)/DROP INDEX/INSERT/CREATE INDEX(F)/DELETE
+let $create_index=   CREATE UNIQUE INDEX IDX1 ON t1 (f2);
+let $insert_record=  INSERT INTO t1 VALUES(1,1);
+let $drop_index=     DROP INDEX IDX1 ON t1;
+let $delete_record=  DELETE FROM t1 WHERE f1 = 1;
+eval CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, PRIMARY KEY(f1)) ENGINE=$engine_type;
+INSERT INTO t1 VALUES(0,1);
+#----------------------------------------------------------------------
+
+#
+--echo # Subtest 7A (one connection, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index
+--echo #    default:    $insert_record (expect to get ER_DUP_ENTRY)
+--echo #    default:    $drop_index
+--echo #    default:    $insert_record
+--echo #    default:    $create_index  (expect to get ER_DUP_ENTRY)
+--echo #    default:    $delete_record
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+let $counter= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_index;
+      --error 0,ER_DUP_ENTRY
+      eval $insert_record;
+      if (!$mysql_errno)
+      {
+         --echo # Error: INSERT was successful though we expected ER_DUP_ENTRY
+         --echo # abort
+         exit;
+      }
+      eval $drop_index;
+      eval $insert_record;
+      # NDB: ER_DUP_UNIQUE, others: ER_DUP_ENTRY
+      --error 0,ER_DUP_ENTRY,ER_DUP_UNIQUE
+      eval $create_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE INDEX was successful though we expected ER_DUP_ENTRY
+         --echo # Error: or ER_DUP_UNIQUE (NDB only)
+         --echo # abort
+         exit;
+      }
+      eval $delete_record;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 7B (one connection, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index
+--echo #    default:    $insert_record (expect to get ER_DUP_ENTRY)
+--echo #    default:    $drop_index
+--echo #    default:    $insert_record
+--echo #    default:    $create_index  (expect to get ER_DUP_ENTRY)
+--echo #    default:    $delete_record
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_index FROM "$create_index";
+eval PREPARE insert_record FROM "$insert_record";
+eval PREPARE delete_record FROM "$delete_record";
+eval PREPARE drop_index FROM "$drop_index";
+let $run= 1;
+let $counter= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_index;
+      --error 0,ER_DUP_ENTRY
+      EXECUTE insert_record;
+      if (!$mysql_errno)
+      {
+         --echo # Error: INSERT was successful though we expected ER_DUP_ENTRY
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_index;
+      EXECUTE insert_record;
+      --error 0,ER_DUP_ENTRY
+      EXECUTE create_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE INDEX was successful though we expected ER_DUP_ENTRY
+         --echo # abort
+         exit;
+      }
+      EXECUTE delete_record;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_index;
+DEALLOCATE PREPARE insert_record;
+DEALLOCATE PREPARE delete_record;
+DEALLOCATE PREPARE drop_index;
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 7C (two connections, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index
+--echo #    default:    $insert_record (expect to get ER_DUP_ENTRY)
+--echo #    con2:       $drop_index
+--echo #    default:    $insert_record
+--echo #    con2:       $create_index  (expect to get ER_DUP_ENTRY)
+--echo #    con2:       $delete_record
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+let $counter= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_index;
+      --error 0,ER_DUP_ENTRY
+      eval $insert_record;
+      if (!$mysql_errno)
+      {
+         --echo # Error: INSERT was successful though we expected ER_DUP_ENTRY
+         --echo # abort
+         exit;
+      }
+      connection con2;
+      eval $drop_index;
+      connection default;
+      eval $insert_record;
+      connection con2;
+      --error 0,ER_DUP_ENTRY
+      eval $create_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE INDEX was successful though we expected ER_DUP_ENTRY
+         --echo # abort
+         exit;
+      }
+      eval $delete_record;
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 7D (two connections, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index
+--echo #    default:    $insert_record (expect to get ER_DUP_ENTRY)
+--echo #    con2:       $drop_index
+--echo #    default:    $insert_record
+--echo #    con2:       $create_index  (expect to get ER_DUP_ENTRY)
+--echo #    con2:       $delete_record
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_index FROM "$create_index";
+eval PREPARE insert_record FROM "$insert_record";
+EXECUTE create_index;
+connection con2;
+eval PREPARE create_index FROM "$create_index";
+eval PREPARE drop_index FROM "$drop_index";
+eval PREPARE delete_record FROM "$delete_record";
+EXECUTE drop_index;
+connection default;
+let $run= 1;
+let $counter= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_index;
+      --error 0,ER_DUP_ENTRY
+      EXECUTE insert_record;
+      if (!$mysql_errno)
+      {
+         --echo # Error: INSERT was successful though we expected ER_DUP_ENTRY
+         --echo # abort
+         exit;
+      }
+      connection con2;
+      EXECUTE drop_index;
+      connection default;
+      EXECUTE insert_record;
+      connection con2;
+      --error 0,ER_DUP_ENTRY
+      EXECUTE create_index;
+      if (!$mysql_errno)
+      {
+         --echo # Error: CREATE INDEX was successful though we expected ER_DUP_ENTRY
+         --echo # abort
+         exit;
+      }
+      EXECUTE delete_record;
+      connection default;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_index;
+DEALLOCATE PREPARE insert_record;
+connection con2;
+DEALLOCATE PREPARE create_index;
+DEALLOCATE PREPARE drop_index;
+DEALLOCATE PREPARE delete_record;
+connection default;
+--enable_result_log
+--enable_query_log
+
+DROP TABLE t1;
diff --git a/mysql-test/suite/stress/include/ddl8.inc b/mysql-test/suite/stress/include/ddl8.inc
new file mode 100644
index 00000000000..85a70770a56
--- /dev/null
+++ b/mysql-test/suite/stress/include/ddl8.inc
@@ -0,0 +1,302 @@
+######## include/ddl8.inc ######
+#
+# Stress the storage engine with rapid CREATE/DROP TABLE/INDEX
+# and following SELECT/INSERT/SHOW etc.
+# Subtest 8 variants (8A - 8D)
+#
+# The variables
+#     $loop_size -- number of rounds till we look at the clock again
+#     $runtime   -- rough intended runtime per subtest variant
+#     $engine_type -- storage engine to be used in CREATE TABLE
+# must be set within the routine sourcing this script.
+#
+# Other stuff which must already exist:
+# - connection con2
+# - stmt_start and stmt_break prepared by the default connection
+#
+# Please look for more details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+
+#----------------------------------------------------------------------
+# Settings for Subtest 8 variants
+# Scenario: CREATE INDEX variant1/SHOW/DROP INDEX/
+#           CREATE INDEX variant2/SHOW/DROP INDEX
+let $create_index1=  CREATE INDEX IDX ON t1 (f2);
+let $create_index2=  CREATE UNIQUE INDEX IDX ON t1 (f2);
+let $show_table=     SHOW CREATE TABLE t1;
+let $drop_index=     DROP INDEX IDX ON t1;
+eval CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=$engine_type;
+INSERT INTO t1 VALUES(1,1);
+eval $create_index1;
+let $cr_value1= INITIALIZED;
+let $cr_value1= query_get_value($show_table, Create Table, 1);
+eval $drop_index;
+eval $create_index2;
+let $cr_value2= INITIALIZED;
+let $cr_value2= query_get_value($show_table, Create Table, 1);
+eval $drop_index;
+if (`SELECT '$cr_value1' = '$cr_value2'`)
+{
+   --echo # Error during generation of prerequisites.
+   --echo # cr_value1 equals cr_value2
+   --echo # cr_value1: $cr_value1
+   --echo # cr_value2: $cr_value2
+   --echo # abort
+   exit;
+}
+#----------------------------------------------------------------------
+
+#
+--echo # Subtest 8A (one connection, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index1
+--echo #    default:    $show_table
+--echo #    default:    $drop_index
+--echo #    default:    $create_index2
+--echo #    default:    $show_table
+--echo #    default:    $drop_index
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_index1;
+      let $value= INITIALIZED;
+      let $value= query_get_value($show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value1'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value1
+         --echo # abort
+         exit;
+      }
+      eval $drop_index;
+      eval $create_index2;
+      let $value= INITIALIZED;
+      let $value= query_get_value($show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value2'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value2
+         --echo # abort
+         exit;
+      }
+      eval $drop_index;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 8B (one connection, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index1
+--echo #    default:    $show_table
+--echo #    default:    $drop_index
+--echo #    default:    $create_index2
+--echo #    default:    $show_table
+--echo #    default:    $drop_index
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_index1 FROM "$create_index1";
+eval PREPARE create_index2 FROM "$create_index2";
+EXECUTE create_index1;
+eval PREPARE show_table FROM "$show_table";
+eval PREPARE drop_index FROM "$drop_index";
+EXECUTE drop_index;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_index1;
+      let $value= INITIALIZED;
+      let $value= query_get_value(EXECUTE show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value1'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value1
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_index;
+      EXECUTE create_index2;
+      let $value= INITIALIZED;
+      let $value= query_get_value(EXECUTE show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value2'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value2
+         --echo # abort
+         exit;
+      }
+      EXECUTE drop_index;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_index1;
+DEALLOCATE PREPARE create_index2;
+DEALLOCATE PREPARE show_table;
+DEALLOCATE PREPARE drop_index;
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 8C (two connections, no PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index1
+--echo #    con2:       $show_table
+--echo #    default:    $drop_index
+--echo #    default:    $create_index2
+--echo #    con2:       $show_table
+--echo #    default:    $drop_index
+--disable_query_log
+--disable_result_log
+connection default;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      eval $create_index1;
+      connection con2;
+      let $value= INITIALIZED;
+      let $value= query_get_value($show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value1'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value1
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $drop_index;
+      eval $create_index2;
+      connection con2;
+      let $value= INITIALIZED;
+      let $value= query_get_value($show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value2'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value2
+         --echo # abort
+         exit;
+      }
+      connection default;
+      eval $drop_index;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+--enable_result_log
+--enable_query_log
+#
+--echo # Subtest 8D (two connections, use PREPARE/EXECUTE)
+--echo #    connection  action
+--echo #    default:    $create_index1
+--echo #    con2:       $show_table
+--echo #    default:    $drop_index
+--echo #    default:    $create_index2
+--echo #    con2:       $show_table
+--echo #    default:    $drop_index
+--disable_query_log
+--disable_result_log
+connection default;
+eval PREPARE create_index1 FROM "$create_index1";
+eval PREPARE create_index2 FROM "$create_index2";
+eval PREPARE drop_index FROM "$drop_index";
+EXECUTE create_index1;
+connection con2;
+eval PREPARE show_table FROM "$show_table";
+connection default;
+EXECUTE drop_index;
+let $run= 1;
+# Determine the current time.
+EXECUTE stmt_start;
+# Run execution loops till the planned runtime is reached
+while ($run)
+{
+   let $loop_run= $loop_size;
+   while ($loop_run)
+   {
+      EXECUTE create_index1;
+      connection con2;
+      let $value= INITIALIZED;
+      let $value= query_get_value(EXECUTE show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value1'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value1
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE drop_index;
+      EXECUTE create_index2;
+      connection con2;
+      let $value= INITIALIZED;
+      let $value= query_get_value(EXECUTE show_table, Create Table, 1);
+      if (`SELECT '$value' <> '$cr_value2'`)
+      {
+         --echo # Error: Unexpected SHOW CREATE TABLE output
+         --echo # Got:      $value
+         --echo # Expected: $cr_value2
+         --echo # abort
+         exit;
+      }
+      connection default;
+      EXECUTE drop_index;
+      dec $loop_run;
+   }
+   if (`EXECUTE stmt_break`)
+   {
+      let $run= 0;
+   }
+}
+DEALLOCATE PREPARE create_index1;
+DEALLOCATE PREPARE create_index2;
+DEALLOCATE PREPARE drop_index;
+connection con2;
+DEALLOCATE PREPARE show_table;
+connection default;
+--enable_result_log
+--enable_query_log
+
+DROP TABLE t1;
diff --git a/mysql-test/suite/stress/r/ddl_archive.result b/mysql-test/suite/stress/r/ddl_archive.result
new file mode 100644
index 00000000000..47c64a6af94
--- /dev/null
+++ b/mysql-test/suite/stress/r/ddl_archive.result
@@ -0,0 +1,79 @@
+SET @@session.sql_mode = 'NO_ENGINE_SUBSTITUTION';
+PREPARE stmt_start FROM "SELECT UNIX_TIMESTAMP() INTO @start";
+SET @runtime = <intended_runtime>;
+PREPARE stmt_break FROM "SELECT UNIX_TIMESTAMP() - @start > @runtime - 1";
+DROP TABLE IF EXISTS t1;
+# Subtest 2A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = ARCHIVE AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = ARCHIVE AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = ARCHIVE AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = ARCHIVE AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 3A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=ARCHIVE
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=ARCHIVE (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=ARCHIVE
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=ARCHIVE (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=ARCHIVE
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=ARCHIVE (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=ARCHIVE
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=ARCHIVE (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 5A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = ARCHIVE
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = ARCHIVE
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = ARCHIVE
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+# Subtest 5D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = ARCHIVE
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+DEALLOCATE PREPARE stmt_start;
+DEALLOCATE PREPARE stmt_break;
diff --git a/mysql-test/suite/stress/r/ddl_csv.result b/mysql-test/suite/stress/r/ddl_csv.result
new file mode 100644
index 00000000000..3dfa0c8fd15
--- /dev/null
+++ b/mysql-test/suite/stress/r/ddl_csv.result
@@ -0,0 +1,55 @@
+SET @@session.sql_mode = 'NO_ENGINE_SUBSTITUTION';
+PREPARE stmt_start FROM "SELECT UNIX_TIMESTAMP() INTO @start";
+SET @runtime = <intended_runtime>;
+PREPARE stmt_break FROM "SELECT UNIX_TIMESTAMP() - @start > @runtime - 1";
+DROP TABLE IF EXISTS t1;
+# Subtest 2A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = CSV AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = CSV AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = CSV AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = CSV AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 3A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=CSV
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=CSV (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=CSV
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=CSV (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=CSV
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=CSV (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=CSV
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=CSV (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+DEALLOCATE PREPARE stmt_start;
+DEALLOCATE PREPARE stmt_break;
diff --git a/mysql-test/suite/stress/r/ddl_innodb.result b/mysql-test/suite/stress/r/ddl_innodb.result
new file mode 100644
index 00000000000..6417d3e1c5c
--- /dev/null
+++ b/mysql-test/suite/stress/r/ddl_innodb.result
@@ -0,0 +1,251 @@
+SET @@session.sql_mode = 'NO_ENGINE_SUBSTITUTION';
+PREPARE stmt_start FROM "SELECT UNIX_TIMESTAMP() INTO @start";
+SET @runtime = <intended_runtime>;
+PREPARE stmt_break FROM "SELECT UNIX_TIMESTAMP() - @start > @runtime - 1";
+DROP TABLE IF EXISTS t1;
+# Subtest 1A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = InnoDB
+#    default:    INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    default:    DROP TABLE t1
+# Subtest 1B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = InnoDB
+#    default:    INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    default:    DROP TABLE t1
+# Subtest 1C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = InnoDB
+#    con2:       INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    con2:       DROP TABLE t1
+# Subtest 1D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = InnoDB
+#    con2:       INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    con2:       DROP TABLE t1
+# Subtest 2A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = InnoDB AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = InnoDB AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = InnoDB AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = InnoDB AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 3A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=InnoDB;
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB;
+DROP TABLE t1;
+# Subtest 4A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=InnoDB
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=InnoDB
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=InnoDB
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    con2:       SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=InnoDB
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    con2:       SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=InnoDB
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 5A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = InnoDB
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = InnoDB
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = InnoDB
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+# Subtest 5D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = InnoDB
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=InnoDB;
+# Subtest 6A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    DROP INDEX IDX1 ON t1
+# Subtest 6B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    DROP INDEX IDX1 ON t1
+# Subtest 6C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    con2:       DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       DROP INDEX IDX1 ON t1
+# Subtest 6D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    con2:       DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       DROP INDEX IDX1 ON t1
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, PRIMARY KEY(f1)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(0,1);
+# Subtest 7A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    default:    DELETE FROM t1 WHERE f1 = 1
+# Subtest 7B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    default:    DELETE FROM t1 WHERE f1 = 1
+# Subtest 7C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    con2:       DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    con2:       CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    con2:       DELETE FROM t1 WHERE f1 = 1
+# Subtest 7D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    con2:       DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    con2:       CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    con2:       DELETE FROM t1 WHERE f1 = 1
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(1,1);
+CREATE INDEX IDX ON t1 (f2);
+DROP INDEX IDX ON t1;
+CREATE UNIQUE INDEX IDX ON t1 (f2);
+DROP INDEX IDX ON t1;
+# Subtest 8A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+DROP TABLE t1;
+DEALLOCATE PREPARE stmt_start;
+DEALLOCATE PREPARE stmt_break;
diff --git a/mysql-test/suite/stress/r/ddl_memory.result b/mysql-test/suite/stress/r/ddl_memory.result
new file mode 100644
index 00000000000..1700fbc2745
--- /dev/null
+++ b/mysql-test/suite/stress/r/ddl_memory.result
@@ -0,0 +1,251 @@
+SET @@session.sql_mode = 'NO_ENGINE_SUBSTITUTION';
+PREPARE stmt_start FROM "SELECT UNIX_TIMESTAMP() INTO @start";
+SET @runtime = <intended_runtime>;
+PREPARE stmt_break FROM "SELECT UNIX_TIMESTAMP() - @start > @runtime - 1";
+DROP TABLE IF EXISTS t1;
+# Subtest 1A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = MEMORY
+#    default:    INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    default:    DROP TABLE t1
+# Subtest 1B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = MEMORY
+#    default:    INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    default:    DROP TABLE t1
+# Subtest 1C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = MEMORY
+#    con2:       INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    con2:       DROP TABLE t1
+# Subtest 1D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = MEMORY
+#    con2:       INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    con2:       DROP TABLE t1
+# Subtest 2A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = MEMORY AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = MEMORY AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = MEMORY AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = MEMORY AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 3A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MEMORY;
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY;
+DROP TABLE t1;
+# Subtest 4A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MEMORY
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MEMORY
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MEMORY
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    con2:       SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MEMORY
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    con2:       SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MEMORY
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 5A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = MEMORY
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = MEMORY
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = MEMORY
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+# Subtest 5D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = MEMORY
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=MEMORY;
+# Subtest 6A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    DROP INDEX IDX1 ON t1
+# Subtest 6B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    DROP INDEX IDX1 ON t1
+# Subtest 6C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    con2:       DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       DROP INDEX IDX1 ON t1
+# Subtest 6D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    con2:       DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       DROP INDEX IDX1 ON t1
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, PRIMARY KEY(f1)) ENGINE=MEMORY;
+INSERT INTO t1 VALUES(0,1);
+# Subtest 7A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    default:    DELETE FROM t1 WHERE f1 = 1
+# Subtest 7B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    default:    DELETE FROM t1 WHERE f1 = 1
+# Subtest 7C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    con2:       DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    con2:       CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    con2:       DELETE FROM t1 WHERE f1 = 1
+# Subtest 7D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    con2:       DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    con2:       CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    con2:       DELETE FROM t1 WHERE f1 = 1
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=MEMORY;
+INSERT INTO t1 VALUES(1,1);
+CREATE INDEX IDX ON t1 (f2);
+DROP INDEX IDX ON t1;
+CREATE UNIQUE INDEX IDX ON t1 (f2);
+DROP INDEX IDX ON t1;
+# Subtest 8A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+DROP TABLE t1;
+DEALLOCATE PREPARE stmt_start;
+DEALLOCATE PREPARE stmt_break;
diff --git a/mysql-test/suite/stress/r/ddl_myisam.result b/mysql-test/suite/stress/r/ddl_myisam.result
new file mode 100644
index 00000000000..82be55b8371
--- /dev/null
+++ b/mysql-test/suite/stress/r/ddl_myisam.result
@@ -0,0 +1,251 @@
+SET @@session.sql_mode = 'NO_ENGINE_SUBSTITUTION';
+PREPARE stmt_start FROM "SELECT UNIX_TIMESTAMP() INTO @start";
+SET @runtime = <intended_runtime>;
+PREPARE stmt_break FROM "SELECT UNIX_TIMESTAMP() - @start > @runtime - 1";
+DROP TABLE IF EXISTS t1;
+# Subtest 1A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = MyISAM
+#    default:    INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    default:    DROP TABLE t1
+# Subtest 1B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = MyISAM
+#    default:    INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    default:    DROP TABLE t1
+# Subtest 1C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = MyISAM
+#    con2:       INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    con2:       DROP TABLE t1
+# Subtest 1D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = MyISAM
+#    con2:       INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    con2:       DROP TABLE t1
+# Subtest 2A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = MyISAM AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = MyISAM AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = MyISAM AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = MyISAM AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 3A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MyISAM;
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM;
+DROP TABLE t1;
+# Subtest 4A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MyISAM
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MyISAM
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MyISAM
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    con2:       SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=MyISAM
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    con2:       SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=MyISAM
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 5A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = MyISAM
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = MyISAM
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = MyISAM
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+# Subtest 5D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = MyISAM
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=MyISAM;
+# Subtest 6A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    DROP INDEX IDX1 ON t1
+# Subtest 6B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    DROP INDEX IDX1 ON t1
+# Subtest 6C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    con2:       DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       DROP INDEX IDX1 ON t1
+# Subtest 6D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    con2:       DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       DROP INDEX IDX1 ON t1
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, PRIMARY KEY(f1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES(0,1);
+# Subtest 7A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    default:    DELETE FROM t1 WHERE f1 = 1
+# Subtest 7B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    default:    DELETE FROM t1 WHERE f1 = 1
+# Subtest 7C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    con2:       DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    con2:       CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    con2:       DELETE FROM t1 WHERE f1 = 1
+# Subtest 7D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE UNIQUE INDEX IDX1 ON t1 (f2)
+#    default:    INSERT INTO t1 VALUES(1,1) (expect to get ER_DUP_ENTRY)
+#    con2:       DROP INDEX IDX1 ON t1
+#    default:    INSERT INTO t1 VALUES(1,1)
+#    con2:       CREATE UNIQUE INDEX IDX1 ON t1 (f2)  (expect to get ER_DUP_ENTRY)
+#    con2:       DELETE FROM t1 WHERE f1 = 1
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES(1,1);
+CREATE INDEX IDX ON t1 (f2);
+DROP INDEX IDX ON t1;
+CREATE UNIQUE INDEX IDX ON t1 (f2);
+DROP INDEX IDX ON t1;
+# Subtest 8A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+DROP TABLE t1;
+DEALLOCATE PREPARE stmt_start;
+DEALLOCATE PREPARE stmt_break;
diff --git a/mysql-test/suite/stress/r/ddl_ndb.result b/mysql-test/suite/stress/r/ddl_ndb.result
new file mode 100644
index 00000000000..39146e65fb0
--- /dev/null
+++ b/mysql-test/suite/stress/r/ddl_ndb.result
@@ -0,0 +1,216 @@
+SET @@session.sql_mode = 'NO_ENGINE_SUBSTITUTION';
+PREPARE stmt_start FROM "SELECT UNIX_TIMESTAMP() INTO @start";
+SET @runtime = <intended_runtime>;
+PREPARE stmt_break FROM "SELECT UNIX_TIMESTAMP() - @start > @runtime - 1";
+DROP TABLE IF EXISTS t1;
+# Subtest 1A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = NDB
+#    default:    INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    default:    DROP TABLE t1
+# Subtest 1B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = NDB
+#    default:    INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    default:    DROP TABLE t1
+# Subtest 1C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = NDB
+#    con2:       INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    con2:       DROP TABLE t1
+# Subtest 1D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT,f2 BIGINT,UNIQUE(f1),UNIQUE(f2))
+ENGINE = NDB
+#    con2:       INSERT INTO t1 VALUES (1,1), (2,2), (3,3)
+#    con2:       DROP TABLE t1
+# Subtest 2A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = NDB AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = NDB AS SELECT 1 AS f1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    default:    SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = NDB AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 2D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 ENGINE = NDB AS SELECT 1 AS f1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1
+#    default:    DROP TABLE t1
+#    con2:       SELECT COUNT(*) <> 1 FROM t1 WHERE f1 = 1 (expect to get ER_NO_SUCH_TABLE)
+# Subtest 3A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    default:    DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+# Subtest 3D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB
+#    con2:       CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB (expect to get ER_TABLE_EXISTS_ERROR)
+#    default:    DROP TABLE t1
+#    con2:       DROP TABLE t1 (expect to get ER_BAD_TABLE_ERROR)
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=NDB;
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB;
+DROP TABLE t1;
+# Subtest 4A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=NDB
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=NDB
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    default:    SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=NDB
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    con2:       SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 4D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1), UNIQUE (f2)) ENGINE=NDB
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+#    con2:       SHOW CREATE TABLE t1 (expect to get ER_NO_SUCH_TABLE)
+#    default:    CREATE TABLE t1 (f1 BIGINT) ENGINE=NDB
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP TABLE t1
+# Subtest 5A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = NDB
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = NDB
+#    default:    INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    default:    DROP TABLE t1
+# Subtest 5C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = NDB
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+# Subtest 5D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE TABLE t1 (f1 MEDIUMINT NOT NULL AUTO_INCREMENT,f2 BIGINT, UNIQUE(f1)) ENGINE = NDB
+#    con2:       INSERT INTO t1 SET f2 = 9
+#    default:    SELECT f1 <> 1 OR f1 IS NULL FROM t1 WHERE f2 = 9
+#    con2:       DROP TABLE t1
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=NDB;
+# Subtest 6A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    DROP INDEX IDX1 ON t1
+# Subtest 6B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    default:    DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    default:    DROP INDEX IDX1 ON t1
+# Subtest 6C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    con2:       DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       DROP INDEX IDX1 ON t1
+# Subtest 6D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       CREATE INDEX IDX1 ON t1 (f2) (expect to get ER_DUP_KEYNAME)
+#    default:    DROP INDEX IDX1 ON t1
+#    con2:       DROP INDEX IDX1 ON t1 (expect to get ER_CANT_DROP_FIELD_OR_KEY)
+#    default:    CREATE INDEX IDX1 ON t1 (f2)
+#    con2:       DROP INDEX IDX1 ON t1
+DROP TABLE t1;
+CREATE TABLE t1 (f1 BIGINT, f2 BIGINT, UNIQUE(f1)) ENGINE=NDB;
+INSERT INTO t1 VALUES(1,1);
+CREATE INDEX IDX ON t1 (f2);
+DROP INDEX IDX ON t1;
+CREATE UNIQUE INDEX IDX ON t1 (f2);
+DROP INDEX IDX ON t1;
+# Subtest 8A (one connection, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8B (one connection, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    default:    SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8C (two connections, no PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+# Subtest 8D (two connections, use PREPARE/EXECUTE)
+#    connection  action
+#    default:    CREATE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+#    default:    CREATE UNIQUE INDEX IDX ON t1 (f2)
+#    con2:       SHOW CREATE TABLE t1
+#    default:    DROP INDEX IDX ON t1
+DROP TABLE t1;
+DEALLOCATE PREPARE stmt_start;
+DEALLOCATE PREPARE stmt_break;
diff --git a/mysql-test/suite/stress/t/ddl_archive.test b/mysql-test/suite/stress/t/ddl_archive.test
new file mode 100644
index 00000000000..0c47b5fcdd5
--- /dev/null
+++ b/mysql-test/suite/stress/t/ddl_archive.test
@@ -0,0 +1,51 @@
+######## t/ddl_archive.test ######
+#
+# Stress the storage engine ARCHIVE with CREATE/DROP TABLE/INDEX
+#
+# Please look for details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+# Storage engine to be used in CREATE TABLE
+--source include/have_archive.inc
+let $engine_type= ARCHIVE;
+
+
+if (`SELECT $PS_PROTOCOL + $SP_PROTOCOL + $CURSOR_PROTOCOL + $VIEW_PROTOCOL > 0`)
+{
+   --skip Test requires: ps-protocol/sp-protocol/cursor-protocol/view-protocol disabled
+}
+let $run= `SELECT '$BIG_TEST' = '1'`;
+if ($run)
+{
+   # A run started with "--big-test" should be allowed to consume more time.
+   # Rough intended runtime per subtest variant in seconds
+   let $runtime = 5;
+   # number of rounds till we look at the clock again
+   let $loop_size= 100;
+}
+if (!$run)
+{
+   let $runtime = 1;
+   let $loop_size= 20;
+}
+
+
+##### Some preparations needed for the ddl*.inc scripts
+--source suite/stress/include/ddl.pre
+
+# Tests set to comment fail because of CSV limitations
+# (limited number of keys, NULL within index not supported)
+# --source suite/stress/include/ddl1.inc
+--source suite/stress/include/ddl2.inc
+--source suite/stress/include/ddl3.inc
+# --source suite/stress/include/ddl4.inc
+--source suite/stress/include/ddl5.inc
+# --source suite/stress/include/ddl6.inc
+# --source suite/stress/include/ddl7.inc
+# --source suite/stress/include/ddl8.inc
+
+##### Cleanup
+--source suite/stress/include/ddl.cln
diff --git a/mysql-test/suite/stress/t/ddl_csv.test b/mysql-test/suite/stress/t/ddl_csv.test
new file mode 100644
index 00000000000..9f6185c76be
--- /dev/null
+++ b/mysql-test/suite/stress/t/ddl_csv.test
@@ -0,0 +1,51 @@
+######## t/ddl_csv.test ######
+#
+# Stress the storage engine CSV with CREATE/DROP TABLE/INDEX
+#
+# Please look for details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+# Storage engine to be used in CREATE TABLE
+--source include/have_csv.inc
+let $engine_type= CSV;
+
+
+if (`SELECT $PS_PROTOCOL + $SP_PROTOCOL + $CURSOR_PROTOCOL + $VIEW_PROTOCOL > 0`)
+{
+   --skip Test requires: ps-protocol/sp-protocol/cursor-protocol/view-protocol disabled
+}
+let $run= `SELECT '$BIG_TEST' = '1'`;
+if ($run)
+{
+   # A run started with "--big-test" should be allowed to consume more time.
+   # Rough intended runtime per subtest variant in seconds
+   let $runtime = 5;
+   # number of rounds till we look at the clock again
+   let $loop_size= 100;
+}
+if (!$run)
+{
+   let $runtime = 1;
+   let $loop_size= 20;
+}
+
+
+##### Some preparations needed for the ddl*.inc scripts
+--source suite/stress/include/ddl.pre
+
+# Tests set to comment fail because of CSV limitations
+# (limited number of keys, AUTOINC not supported)
+# --source suite/stress/include/ddl1.inc
+--source suite/stress/include/ddl2.inc
+--source suite/stress/include/ddl3.inc
+# --source suite/stress/include/ddl4.inc
+# --source suite/stress/include/ddl5.inc
+# --source suite/stress/include/ddl6.inc
+# --source suite/stress/include/ddl7.inc
+# --source suite/stress/include/ddl8.inc
+
+##### Cleanup
+--source suite/stress/include/ddl.cln
diff --git a/mysql-test/suite/stress/t/ddl_innodb.test b/mysql-test/suite/stress/t/ddl_innodb.test
new file mode 100644
index 00000000000..784ba8ff003
--- /dev/null
+++ b/mysql-test/suite/stress/t/ddl_innodb.test
@@ -0,0 +1,49 @@
+######## t/ddl_innodb.test ######
+#
+# Stress the storage engine InnoDB with CREATE/DROP TABLE/INDEX
+#
+# Please look for details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+# Storage engine to be used in CREATE TABLE
+--source include/have_innodb.inc
+let $engine_type= InnoDB;
+
+
+if (`SELECT $PS_PROTOCOL + $SP_PROTOCOL + $CURSOR_PROTOCOL + $VIEW_PROTOCOL > 0`)
+{
+   --skip Test requires: ps-protocol/sp-protocol/cursor-protocol/view-protocol disabled
+}
+let $run= `SELECT '$BIG_TEST' = '1'`;
+if ($run)
+{
+   # A run started with "--big-test" should be allowed to consume more time.
+   # Rough intended runtime per subtest variant in seconds
+   let $runtime = 5;
+   # number of rounds till we look at the clock again
+   let $loop_size= 100;
+}
+if (!$run)
+{
+   let $runtime = 1;
+   let $loop_size= 20;
+}
+
+
+##### Some preparations needed for the ddl*.inc scripts
+--source suite/stress/include/ddl.pre
+
+--source suite/stress/include/ddl1.inc
+--source suite/stress/include/ddl2.inc
+--source suite/stress/include/ddl3.inc
+--source suite/stress/include/ddl4.inc
+--source suite/stress/include/ddl5.inc
+--source suite/stress/include/ddl6.inc
+--source suite/stress/include/ddl7.inc
+--source suite/stress/include/ddl8.inc
+
+##### Cleanup
+--source suite/stress/include/ddl.cln
diff --git a/mysql-test/suite/stress/t/ddl_memory.test b/mysql-test/suite/stress/t/ddl_memory.test
new file mode 100644
index 00000000000..5178439bff1
--- /dev/null
+++ b/mysql-test/suite/stress/t/ddl_memory.test
@@ -0,0 +1,48 @@
+######## t/ddl_memory.test ######
+#
+# Stress the storage engine MEMORY with CREATE/DROP TABLE/INDEX
+#
+# Please look for details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+# Storage engine to be used in CREATE TABLE
+let $engine_type= MEMORY;
+
+
+if (`SELECT $PS_PROTOCOL + $SP_PROTOCOL + $CURSOR_PROTOCOL + $VIEW_PROTOCOL > 0`)
+{
+   --skip Test requires: ps-protocol/sp-protocol/cursor-protocol/view-protocol disabled
+}
+let $run= `SELECT '$BIG_TEST' = '1'`;
+if ($run)
+{
+   # A run started with "--big-test" should be allowed to consume more time.
+   # Rough intended runtime per subtest variant in seconds
+   let $runtime = 5;
+   # number of rounds till we look at the clock again
+   let $loop_size= 100;
+}
+if (!$run)
+{
+   let $runtime = 1;
+   let $loop_size= 20;
+}
+
+
+##### Some preparations needed for the ddl*.inc scripts
+--source suite/stress/include/ddl.pre
+
+--source suite/stress/include/ddl1.inc
+--source suite/stress/include/ddl2.inc
+--source suite/stress/include/ddl3.inc
+--source suite/stress/include/ddl4.inc
+--source suite/stress/include/ddl5.inc
+--source suite/stress/include/ddl6.inc
+--source suite/stress/include/ddl7.inc
+--source suite/stress/include/ddl8.inc
+
+##### Cleanup
+--source suite/stress/include/ddl.cln
diff --git a/mysql-test/suite/stress/t/ddl_myisam.test b/mysql-test/suite/stress/t/ddl_myisam.test
new file mode 100644
index 00000000000..8d6226e573b
--- /dev/null
+++ b/mysql-test/suite/stress/t/ddl_myisam.test
@@ -0,0 +1,48 @@
+######## t/ddl_myisam.test ######
+#
+# Stress the storage engine MyISAM with CREATE/DROP TABLE/INDEX
+#
+# Please look for details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+# Storage engine to be used in CREATE TABLE
+let $engine_type= MyISAM;
+
+
+if (`SELECT $PS_PROTOCOL + $SP_PROTOCOL + $CURSOR_PROTOCOL + $VIEW_PROTOCOL > 0`)
+{
+   --skip Test requires: ps-protocol/sp-protocol/cursor-protocol/view-protocol disabled
+}
+let $run= `SELECT '$BIG_TEST' = '1'`;
+if ($run)
+{
+   # A run started with "--big-test" should be allowed to consume more time.
+   # Rough intended runtime per subtest variant in seconds
+   let $runtime = 5;
+   # number of rounds till we look at the clock again
+   let $loop_size= 100;
+}
+if (!$run)
+{
+   let $runtime = 1;
+   let $loop_size= 20;
+}
+
+
+##### Some preparations needed for the ddl*.inc scripts
+--source suite/stress/include/ddl.pre
+
+--source suite/stress/include/ddl1.inc
+--source suite/stress/include/ddl2.inc
+--source suite/stress/include/ddl3.inc
+--source suite/stress/include/ddl4.inc
+--source suite/stress/include/ddl5.inc
+--source suite/stress/include/ddl6.inc
+--source suite/stress/include/ddl7.inc
+--source suite/stress/include/ddl8.inc
+
+##### Cleanup
+--source suite/stress/include/ddl.cln
diff --git a/mysql-test/suite/stress/t/ddl_ndb.test b/mysql-test/suite/stress/t/ddl_ndb.test
new file mode 100644
index 00000000000..7eb45da8739
--- /dev/null
+++ b/mysql-test/suite/stress/t/ddl_ndb.test
@@ -0,0 +1,56 @@
+######## t/ddl_ndb.test ######
+#
+# Stress the storage engine NDB with CREATE/DROP TABLE/INDEX
+#
+# Please look for details within include/ddl1.inc.
+#
+# Creation of this test:
+# 2007-07-04 mleich
+#
+
+# Storage engine to be used in CREATE TABLE
+--source include/have_ndb.inc
+let $engine_type= NDB;
+
+
+if (`SELECT $PS_PROTOCOL + $SP_PROTOCOL + $CURSOR_PROTOCOL + $VIEW_PROTOCOL > 0`)
+{
+   --skip Test requires: ps-protocol/sp-protocol/cursor-protocol/view-protocol disabled
+}
+# Attention: We set here much smaller values for $runtime and $loop_size compared
+#            to the other storage engines.
+#            The reason is that NDB is extreme slow and should not exceed
+#            the "testcase-timeout".
+let $run= `SELECT '$BIG_TEST' = '1'`;
+if ($run)
+{
+   # A run started with "--big-test" should be allowed to consume more time.
+   # Rough intended runtime per subtest variant in seconds
+   let $runtime = 5;
+   # number of rounds till we look at the clock again
+   let $loop_size= 3;
+}
+if (!$run)
+{
+   let $runtime = 1;
+   let $loop_size= 1;
+}
+
+
+##### Some preparations needed for the ddl*.inc scripts
+--source suite/stress/include/ddl.pre
+
+--source suite/stress/include/ddl1.inc
+--source suite/stress/include/ddl2.inc
+--source suite/stress/include/ddl3.inc
+--source suite/stress/include/ddl4.inc
+--source suite/stress/include/ddl5.inc
+--source suite/stress/include/ddl6.inc
+# The following test suffers from
+#   Bug#26043 UNIQUE INDEX create always fails after constraint violation
+# and is therefore set to comment.
+# --source suite/stress/include/ddl7.inc
+--source suite/stress/include/ddl8.inc
+
+##### Cleanup
+--source suite/stress/include/ddl.cln