MDEV-20804 Speed up main.index_merge_innodb

The test main.index_merge_innodb is taking very much time,
especially on later versions (10.2 and 10.3).

Some of this could be attributed to the use of INSERT...SELECT,
which is time-consumingly creating explicit record locks in InnoDB
for the locking read in the SELECT part.

In 10.3 and later, some slowness can be attributed to MDEV-12288,
which makes the InnoDB purge thread spend time to reset transaction
identifiers in the inserted records. If we prevent purge from
running before all tables are dropped, the test seems to be
10% faster on an unoptimized debug build on 10.5. (A proper fix
would be to implement MDEV-515 and stop writing row-level undo log
records for inserts into an empty table or partition.)

At the same time, it should not hurt to make main.index_merge_myisam
to use the sequence engine. Not only could it be a little faster,
but the test would be slightly more readable.

9 files changed, 83 insertions, 272 deletions

diff --git a/mysql-test/include/index_merge1.inc b/mysql-test/include/index_merge1.inc
index 7880091ac10..7e656eb38af 100644
--- a/mysql-test/include/index_merge1.inc
+++ b/mysql-test/include/index_merge1.inc
@@ -2,11 +2,10 @@
 #
 # Index merge tests
 #
-# The variables
-#     $engine_type         -- storage engine to be tested
+# The variable
 #     $merge_table_support -- 1 storage engine supports merge tables
 #                          -- 0 storage engine does not support merge tables
-# have to be set before sourcing this script.
+# has to be set before sourcing this script.
 #
 # Note: The comments/expectations refer to MyISAM.
 #       They might be not valid for other storage engines.
@@ -16,15 +15,10 @@
 #               old name was t/index_merge.test
 #               main code went into include/index_merge1.inc
 #
+--source include/have_sequence.inc
 
 --echo #---------------- Index merge test 1 -------------------------------------------
 
-eval SET SESSION STORAGE_ENGINE = $engine_type;
-
---disable_warnings
-drop table if exists t0, t1, t2, t3, t4;
---enable_warnings
-
 # Create and fill a table with simple keys
 create table t0
 (
@@ -32,20 +26,7 @@ create table t0
   INDEX i1(key1)
 );
 
---disable_query_log
-insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
-
-let $1=7;
-set @d=8;
-begin;
-while ($1)
-{
-  eval insert into t0 select key1+@d from t0;
-  eval set @d=@d*2;
-  dec $1;
-}
-commit;
---enable_query_log
+insert into t0(key1) select seq from seq_1_to_1024;
 
 alter table t0 add key2 int not null, add index i2(key2);
 alter table t0 add key3 int not null, add index i3(key3);
@@ -215,7 +196,7 @@ create table t4 (
   index i2_2(key2, key2_1)
 );
 
-insert into t4 select key1,key1,key1 div 10, key1 % 10, key1 % 10, key1 from t0;
+insert into t4 select seq,seq,seq div 10, seq % 10, seq % 10, seq from seq_1_to_1024;
 
 #   the following will be handled by index_merge:
 select * from t4 where key1a = 3 or key1b = 4;
@@ -390,14 +371,13 @@ if ($merge_table_support)
 #
 # BUG#17314: Index_merge/intersection not choosen by the optimizer for MERGE tables
 #
-create table t0 (a int);
-insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
 create table t1 (
   a int, b int,
   filler1 char(200), filler2 char(200),
   key(a),key(b)
 );
-insert into t1 select @v:= A.a, @v, 't1', 'filler2' from t0 A, t0 B, t0 C;
+insert into t1 select @v:= seq % 10, @v, 't1', 'filler2' from seq_1_to_1000;
+
 create table t2 like t1;
 
 create table t3 (
@@ -411,8 +391,7 @@ explain select * from t1 where a=1 and b=1;
 --replace_column 9 #
 explain select * from t3 where a=1 and b=1;
 
-drop table t3;
-drop table t0, t1, t2;
+drop table t1, t2, t3;
 }
 
 #
@@ -511,16 +490,13 @@ DROP TABLE t1;
 --echo #
 --echo # BUG#40974: Incorrect query results when using clause evaluated using range check
 --echo #
-create table t0 (a int);
-insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
-
 create table t1 (a int);
 insert into t1 values (1),(2);
 create table t2(a int, b int);
 insert into t2 values (1,1), (2, 1000);
 create table t3 (a int, b int, filler char(100), key(a), key(b));
 
-insert into t3 select 1000, 1000,'filler' from t0 A, t0 B, t0 C; 
+insert into t3 select 1000, 1000,'filler' from seq_1_to_1000;
 insert into t3 values (1,1,'data');
 insert into t3 values (1,1,'data');
 -- echo The plan should be ALL/ALL/ALL(Range checked for each record (index map: 0x3)
@@ -532,20 +508,14 @@ select * from t1
 where exists (select 1 from t2, t3 
               where t2.a=t1.a and (t3.a=t2.b or t3.b=t2.b or t3.b=t2.b+1));
 
-drop table t0, t1, t2, t3;
+drop table t1, t2, t3;
 
 --echo #
 --echo # BUG#44810: index merge and order by with low sort_buffer_size 
 --echo # crashes server!
 --echo #
 CREATE TABLE t1(a VARCHAR(128),b VARCHAR(128),KEY(A),KEY(B));
-INSERT INTO t1 VALUES (REPEAT('a',128),REPEAT('b',128));
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT REPEAT('a',128),REPEAT('b',128) FROM seq_1_to_64;
 SET SESSION sort_buffer_size=1024*8;
 EXPLAIN 
 SELECT * FROM t1 FORCE INDEX(a,b) WHERE a LIKE 'a%' OR b LIKE 'b%' 
diff --git a/mysql-test/include/index_merge2.inc b/mysql-test/include/index_merge2.inc
index ae9adac882f..ecb16f54bbc 100644
--- a/mysql-test/include/index_merge2.inc
+++ b/mysql-test/include/index_merge2.inc
@@ -2,10 +2,6 @@
 #
 # Index merge tests
 #
-# The variable
-#     $engine_type       -- storage engine to be tested
-# has to be set before sourcing this script.
-#
 # Note: The comments/expectations refer to InnoDB.
 #       They might be not valid for other storage engines.
 #
@@ -14,15 +10,10 @@
 #               old name was t/index_merge_innodb.test
 #               main code went into include/index_merge2.inc
 #
+--source include/have_sequence.inc
 
 --echo #---------------- Index merge test 2 -------------------------------------------
 
-eval SET SESSION STORAGE_ENGINE = $engine_type;
-
---disable_warnings
-drop table if exists t1,t2;
---enable_warnings
-
 create table t1
 (
   key1 int not null,
@@ -32,16 +23,7 @@ create table t1
   INDEX i2(key2)
 );
 
---disable_query_log
-let $1=200;
-begin;
-while ($1)
-{
-  eval insert into t1 values (200-$1, $1);
-  dec $1;
-}
-commit;
---enable_query_log
+INSERT INTO t1 SELECT seq,200-seq FROM seq_0_to_200;
 
 # No primary key
 explain select * from t1 where key1 < 5 or key2 > 197;
@@ -80,16 +62,8 @@ create table t1 (
   index (key2)
 );
 show warnings;
---disable_query_log
-let $1=30;
-begin;
-while ($1)
-{
-  eval insert into t1 (key1, key2, filler) values ($1/4, $1/8, 'filler-data');
-  dec $1;
-}
-commit;
---enable_query_log
+INSERT INTO t1 (key1, key2, filler)
+SELECT seq/4, seq/8, 'filler-data' FROM seq_30_to_0;
 explain select pk from t1 where key1 = 1 and key2 = 1;
 select pk from t1 where key2 = 1 and key1 = 1;
 select pk from t1 ignore index(key1,key2) where key2 = 1 and key1 = 1;
@@ -331,19 +305,7 @@ create table t1
   key3 int not null default 0
 );
 
-insert into t1(key1) values (1),(2),(3),(4),(5),(6),(7),(8);
-
-let $1=7;
-set @d=8;
-begin;
-while ($1)
-{
-  eval insert into t1 (key1) select key1+@d from t1;
-  eval set @d=@d*2;
-  dec $1;
-}
-commit;
-
+insert into t1(key1) select seq from seq_1_to_1024;
 alter table t1 add index i2(key2);
 alter table t1 add index i3(key3);
 update t1 set key2=key1,key3=key1;
diff --git a/mysql-test/include/index_merge_2sweeps.inc b/mysql-test/include/index_merge_2sweeps.inc
index ef356e12969..836f83795a9 100644
--- a/mysql-test/include/index_merge_2sweeps.inc
+++ b/mysql-test/include/index_merge_2sweeps.inc
@@ -2,24 +2,15 @@
 #
 # 2-sweeps read Index_merge test
 #
-# The variable
-#     $engine_type       -- storage engine to be tested
-# has to be set before sourcing this script.
-#
 # Last update:
 # 2006-08-02 ML test refactored
 #               old name was index_merge_innodb2.test
 #               main code went into include/index_merge_2sweeps.inc
 #
+--source include/have_sequence.inc
 
 --echo #---------------- 2-sweeps read Index merge test 2 -------------------------------
 
-eval SET SESSION STORAGE_ENGINE = $engine_type;
-
---disable_warnings
-drop table if exists t1;
---enable_warnings
-
 create table t1 (
   pk int primary key,
   key1 int,
@@ -30,17 +21,8 @@ create table t1 (
   index(key2)
 );
 
-
---disable_query_log
-begin;
-let $1=1000;
-while ($1)
-{
-  eval insert into t1 values($1, $1, $1, 'filler-data','filler-data-2');
-  dec $1;
-}
-commit;
---enable_query_log
+insert into t1 select seq, seq, seq, 'filler-data', 'filler-data-2'
+from seq_1000_to_1;
 
 select * from t1 where (key1 >= 2 and key1 <= 10) or (pk >= 4 and pk <=8 );
 
diff --git a/mysql-test/include/index_merge_ror.inc b/mysql-test/include/index_merge_ror.inc
index 3ec6e342994..8a55ef1a67d 100644
--- a/mysql-test/include/index_merge_ror.inc
+++ b/mysql-test/include/index_merge_ror.inc
@@ -17,11 +17,6 @@
 
 --echo #---------------- ROR-index_merge tests -----------------------
 
-eval SET SESSION STORAGE_ENGINE = $engine_type;
-
---disable_warnings
-drop table if exists  t0,t1,t2;
---enable_warnings
 create table t1
 (
   /* Field names reflect value(rowid) distribution, st=STairs, swt= SaWTooth */
diff --git a/mysql-test/include/index_merge_ror_cpk.inc b/mysql-test/include/index_merge_ror_cpk.inc
index 0a307aa4fdb..9ebca3cd22f 100644
--- a/mysql-test/include/index_merge_ror_cpk.inc
+++ b/mysql-test/include/index_merge_ror_cpk.inc
@@ -2,10 +2,6 @@
 #
 # Clustered PK ROR-index_merge tests
 #
-# The variable
-#     $engine_type       -- storage engine to be tested
-# has to be set before sourcing this script.
-#
 # Note: The comments/expectations refer to InnoDB.
 #       They might be not valid for other storage engines.
 #
@@ -15,13 +11,9 @@
 #               main code went into include/index_merge_ror_cpk.inc
 #
 
---echo #---------------- Clustered PK ROR-index_merge tests -----------------------------
-
-eval SET SESSION STORAGE_ENGINE = $engine_type;
+--source include/have_sequence.inc
 
---disable_warnings
-drop table if exists  t1;
---enable_warnings
+--echo #---------------- Clustered PK ROR-index_merge tests -----------------------------
 
 create table t1
 (
diff --git a/mysql-test/r/index_merge_innodb.result b/mysql-test/r/index_merge_innodb.result
index 7e2a13128bb..0a80fa4171c 100644
--- a/mysql-test/r/index_merge_innodb.result
+++ b/mysql-test/r/index_merge_innodb.result
@@ -1,8 +1,9 @@
+# Disable the purge of InnoDB history, to make the test run faster.
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+SET STORAGE_ENGINE = InnoDB;
 set @optimizer_switch_save= @@optimizer_switch;
 set optimizer_switch='index_merge_sort_intersection=off';
 #---------------- Index merge test 2 -------------------------------------------
-SET SESSION STORAGE_ENGINE = InnoDB;
-drop table if exists t1,t2;
 create table t1
 (
 key1 int not null,
@@ -10,6 +11,7 @@ key2 int not null,
 INDEX i1(key1),
 INDEX i2(key2)
 );
+INSERT INTO t1 SELECT seq,200-seq FROM seq_0_to_200;
 explain select * from t1 where key1 < 5 or key2 > 197;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using sort_union(i1,i2); Using where
@@ -67,6 +69,8 @@ index (key2)
 );
 show warnings;
 Level	Code	Message
+INSERT INTO t1 (key1, key2, filler)
+SELECT seq/4, seq/8, 'filler-data' FROM seq_30_to_0;
 explain select pk from t1 where key1 = 1 and key2 = 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index_merge	key1,key2	key1,key2	5,4	NULL	1	Using intersect(key1,key2); Using where; Using index
@@ -292,24 +296,7 @@ key1 int not null,
 key2 int not null default 0,
 key3 int not null default 0
 );
-insert into t1(key1) values (1),(2),(3),(4),(5),(6),(7),(8);
-set @d=8;
-begin;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-commit;
+insert into t1(key1) select seq from seq_1_to_1024;
 alter table t1 add index i2(key2);
 alter table t1 add index i3(key3);
 update t1 set key2=key1,key3=key1;
@@ -388,8 +375,6 @@ a	b
 1	b
 DROP TABLE t1, t2;
 #---------------- 2-sweeps read Index merge test 2 -------------------------------
-SET SESSION STORAGE_ENGINE = InnoDB;
-drop table if exists t1;
 create table t1 (
 pk int primary key,
 key1 int,
@@ -399,6 +384,8 @@ filler2 char(200),
 index(key1),
 index(key2)
 );
+insert into t1 select seq, seq, seq, 'filler-data', 'filler-data-2'
+from seq_1000_to_1;
 select * from t1 where (key1 >= 2 and key1 <= 10) or (pk >= 4 and pk <=8 );
 pk	key1	key2	filler	filler2
 2	2	2	filler-data	filler-data-2
@@ -526,8 +513,6 @@ pk	key1	key2	filler	filler2
 54	54	54	filler-data	filler-data-2
 drop table t1;
 #---------------- Clustered PK ROR-index_merge tests -----------------------------
-SET SESSION STORAGE_ENGINE = InnoDB;
-drop table if exists  t1;
 create table t1
 (
 pk1 int not null,
@@ -668,34 +653,27 @@ DROP TABLE t1,t2;
 # 
 # BUG#56862/640419: Wrong result with sort_union index merge when one
 #                   of the merged index scans is the primary key scan
-# 
+#
+CREATE TABLE t0(a int, b int) ENGINE=MyISAM;
 CREATE TABLE t1 (
 pk int NOT NULL AUTO_INCREMENT PRIMARY KEY,
 a int,
 b int,
 INDEX idx(a))
 ENGINE=INNODB;
-begin;
-INSERT INTO t1(a,b) VALUES
+INSERT INTO t0(a,b) VALUES
 (11, 1100), (2, 200), (1, 100), (14, 1400), (5, 500),
 (3, 300), (17, 1700), (4, 400), (12, 1200), (8, 800),
 (6, 600), (18, 1800), (9, 900), (10, 1000), (7, 700),
 (13, 1300), (15, 1500), (19, 1900), (16, 1600), (20, 2000);
-INSERT INTO t1(a,b) SELECT a+20, b+2000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+40, b+4000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+80, b+8000 FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
+INSERT INTO t0(a,b) SELECT a+20, b+2000 FROM t0;
+INSERT INTO t0(a,b) SELECT a+40, b+4000 FROM t0;
+INSERT INTO t0(a,b) SELECT a+80, b+8000 FROM t0;
+begin;
+INSERT INTO t1(a,b) SELECT t0.a,t0.b FROM t0, seq_1_to_1024;
 INSERT INTO t1 VALUES (1000000, 0, 0);
 commit;
+DROP TABLE t0;
 SET SESSION sort_buffer_size = 1024*36;
 set @tmp_optimizer_switch=@@optimizer_switch;
 set optimizer_switch='derived_merge=off,derived_with_keys=off';
@@ -759,8 +737,6 @@ DROP TABLE t1;
 #
 # BUG#1006164: Multi-table DELETE that uses innodb + index_merge/intersect may fail to delete rows
 #
-create table t0(a int);
-insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
 create table t1 (
 pk int auto_increment, 
 zone_id int,
@@ -769,7 +745,7 @@ primary key(pk),
 key (zone_id),
 key (modified)
 ) engine=innodb;
-insert into t1 (zone_id, modified) select 0,0 from t0 A, t0 B, t0 C, t0 D;
+insert into t1 (zone_id, modified) select 0,0 from seq_1_to_10000;
 update t1 set zone_id=487, modified=9 where pk=7259;
 update t1 set zone_id=487, modified=9 where pk=7260;
 update t1 set zone_id=830, modified=9 where pk=8434;
@@ -787,7 +763,7 @@ DELETE t1 FROM t1 WHERE t1.zone_id=830 AND modified=9;
 commit;
 select * from t1 where t1.zone_id=830 AND modified=9;
 pk	zone_id	modified
-drop table t0, t1;
+drop table t1;
 #
 # MDEV-376: Wrong result (missing rows) with index_merge+index_merge_intersection, join
 #
@@ -822,14 +798,10 @@ PRIMARY KEY (pk),
 KEY key1 (key1),
 KEY key2 (key2)
 ) ENGINE=InnoDB AUTO_INCREMENT=12860259 DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT;
-create table t2(a int);
-insert into t2 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
-create table t3(a int);
-insert into t3 select A.a + B.a* 10 + C.a * 100 + D.a*1000 from t2 A, t2 B, t2 C, t2 D;
 insert into t1 (key1, key2, col1,col2,col3,col4)
-select  a,a, a,a,a,a from t3;
+select seq,seq,seq,seq,seq,seq from seq_1_to_10000;
 SELECT sum(col1) FROM t1 FORCE INDEX (key1,key2) WHERE  (key1 between 10 and 8191+10) or (key2= 5);
 sum(col1)
 33632261
-drop table t1,t2,t3;
+drop table t1;
 set optimizer_switch=@tmp_optimizer_switch;
diff --git a/mysql-test/r/index_merge_myisam.result b/mysql-test/r/index_merge_myisam.result
index c0823d41b14..b87a7dfef4b 100644
--- a/mysql-test/r/index_merge_myisam.result
+++ b/mysql-test/r/index_merge_myisam.result
@@ -1,13 +1,13 @@
+SET STORAGE_ENGINE = MyISAM;
 set @optimizer_switch_save= @@optimizer_switch;
 set optimizer_switch='index_merge_sort_intersection=off';
 #---------------- Index merge test 1 -------------------------------------------
-SET SESSION STORAGE_ENGINE = MyISAM;
-drop table if exists t0, t1, t2, t3, t4;
 create table t0
 (
 key1 int not null,
 INDEX i1(key1)
 );
+insert into t0(key1) select seq from seq_1_to_1024;
 alter table t0 add key2 int not null, add index i2(key2);
 alter table t0 add key3 int not null, add index i3(key3);
 alter table t0 add key4 int not null, add index i4(key4);
@@ -225,7 +225,7 @@ index i2_2(key2, key2_1)
 );
 Warnings:
 Note	1831	Duplicate index `i2_2`. This is deprecated and will be disallowed in a future release.
-insert into t4 select key1,key1,key1 div 10, key1 % 10, key1 % 10, key1 from t0;
+insert into t4 select seq,seq,seq div 10, seq % 10, seq % 10, seq from seq_1_to_1024;
 select * from t4 where key1a = 3 or key1b = 4;
 key1a	key1b	key2	key2_1	key2_2	key3
 3	3	0	3	3	3
@@ -411,14 +411,12 @@ explain select * from t1 force index(cola,colb) WHERE cola = 'foo' AND colb = 'b
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index_merge	cola,colb	cola,colb	3,3	NULL	32	Using intersect(cola,colb); Using where
 drop table t1;
-create table t0 (a int);
-insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
 create table t1 (
 a int, b int,
 filler1 char(200), filler2 char(200),
 key(a),key(b)
 );
-insert into t1 select @v:= A.a, @v, 't1', 'filler2' from t0 A, t0 B, t0 C;
+insert into t1 select @v:= seq % 10, @v, 't1', 'filler2' from seq_1_to_1000;
 create table t2 like t1;
 create table t3 (
 a int, b int,
@@ -431,8 +429,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain select * from t3 where a=1 and b=1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t3	index_merge	a,b	a,b	5,5	NULL	#	Using intersect(a,b); Using where
-drop table t3;
-drop table t0, t1, t2;
+drop table t1, t2, t3;
 CREATE TABLE t1(a INT);
 INSERT INTO t1 VALUES(1);
 CREATE TABLE t2(a INT, b INT, dummy CHAR(16) DEFAULT '', KEY(a), KEY(b));
@@ -537,14 +534,12 @@ DROP TABLE t1;
 #
 # BUG#40974: Incorrect query results when using clause evaluated using range check
 #
-create table t0 (a int);
-insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
 create table t1 (a int);
 insert into t1 values (1),(2);
 create table t2(a int, b int);
 insert into t2 values (1,1), (2, 1000);
 create table t3 (a int, b int, filler char(100), key(a), key(b));
-insert into t3 select 1000, 1000,'filler' from t0 A, t0 B, t0 C;
+insert into t3 select 1000, 1000,'filler' from seq_1_to_1000;
 insert into t3 values (1,1,'data');
 insert into t3 values (1,1,'data');
 The plan should be ALL/ALL/ALL(Range checked for each record (index map: 0x3)
@@ -561,19 +556,13 @@ where t2.a=t1.a and (t3.a=t2.b or t3.b=t2.b or t3.b=t2.b+1));
 a
 1
 2
-drop table t0, t1, t2, t3;
+drop table t1, t2, t3;
 #
 # BUG#44810: index merge and order by with low sort_buffer_size 
 # crashes server!
 #
 CREATE TABLE t1(a VARCHAR(128),b VARCHAR(128),KEY(A),KEY(B));
-INSERT INTO t1 VALUES (REPEAT('a',128),REPEAT('b',128));
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
-INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT REPEAT('a',128),REPEAT('b',128) FROM seq_1_to_64;
 SET SESSION sort_buffer_size=1024*8;
 EXPLAIN 
 SELECT * FROM t1 FORCE INDEX(a,b) WHERE a LIKE 'a%' OR b LIKE 'b%' 
@@ -586,8 +575,6 @@ SET SESSION sort_buffer_size=DEFAULT;
 DROP TABLE t1;
 End of 5.0 tests
 #---------------- ROR-index_merge tests -----------------------
-SET SESSION STORAGE_ENGINE = MyISAM;
-drop table if exists  t0,t1,t2;
 create table t1
 (
 /* Field names reflect value(rowid) distribution, st=STairs, swt= SaWTooth */
@@ -836,8 +823,6 @@ SELECT * FROM t1;
 c1	c2	c3
 DROP TABLE t1,t2;
 #---------------- Index merge test 2 -------------------------------------------
-SET SESSION STORAGE_ENGINE = MyISAM;
-drop table if exists t1,t2;
 create table t1
 (
 key1 int not null,
@@ -845,6 +830,7 @@ key2 int not null,
 INDEX i1(key1),
 INDEX i2(key2)
 );
+INSERT INTO t1 SELECT seq,200-seq FROM seq_0_to_200;
 explain select * from t1 where key1 < 5 or key2 > 197;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	10	Using sort_union(i1,i2); Using where
@@ -902,6 +888,8 @@ index (key2)
 );
 show warnings;
 Level	Code	Message
+INSERT INTO t1 (key1, key2, filler)
+SELECT seq/4, seq/8, 'filler-data' FROM seq_30_to_0;
 explain select pk from t1 where key1 = 1 and key2 = 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	key1,key2	key1	5	const	4	Using where
@@ -1127,24 +1115,7 @@ key1 int not null,
 key2 int not null default 0,
 key3 int not null default 0
 );
-insert into t1(key1) values (1),(2),(3),(4),(5),(6),(7),(8);
-set @d=8;
-begin;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-insert into t1 (key1) select key1+@d from t1;
-set @d=@d*2;
-commit;
+insert into t1(key1) select seq from seq_1_to_1024;
 alter table t1 add index i2(key2);
 alter table t1 add index i3(key3);
 update t1 set key2=key1,key3=key1;
@@ -1223,8 +1194,6 @@ a	b
 1	b
 DROP TABLE t1, t2;
 #---------------- 2-sweeps read Index merge test 2 -------------------------------
-SET SESSION STORAGE_ENGINE = MyISAM;
-drop table if exists t1;
 create table t1 (
 pk int primary key,
 key1 int,
@@ -1234,6 +1203,8 @@ filler2 char(200),
 index(key1),
 index(key2)
 );
+insert into t1 select seq, seq, seq, 'filler-data', 'filler-data-2'
+from seq_1000_to_1;
 select * from t1 where (key1 >= 2 and key1 <= 10) or (pk >= 4 and pk <=8 );
 pk	key1	key2	filler	filler2
 10	10	10	filler-data	filler-data-2
@@ -1361,8 +1332,6 @@ pk	key1	key2	filler	filler2
 1	1	1	filler-data	filler-data-2
 drop table t1;
 #---------------- Clustered PK ROR-index_merge tests -----------------------------
-SET SESSION STORAGE_ENGINE = MyISAM;
-drop table if exists  t1;
 create table t1
 (
 pk1 int not null,
@@ -1723,22 +1692,7 @@ create table t0
 key1 int not null,
 INDEX i1(key1)
 );
-insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
-set @d=8;
-insert into t0 select key1+ @d from t0;
-set @d=@d*2;
-insert into t0 select key1+ @d from t0;
-set @d=@d*2;
-insert into t0 select key1+ @d from t0;
-set @d=@d*2;
-insert into t0 select key1+ @d from t0;
-set @d=@d*2;
-insert into t0 select key1+ @d from t0;
-set @d=@d*2;
-insert into t0 select key1+ @d from t0;
-set @d=@d*2;
-insert into t0 select key1+ @d from t0;
-set @d=@d*2;
+insert into t0 select * from seq_1_to_1024;
 alter table t0 add key2 int not null, add index i2(key2);
 alter table t0 add key3 int not null, add index i3(key3);
 alter table t0 add key8 int not null, add index i8(key8);
diff --git a/mysql-test/t/index_merge_innodb.test b/mysql-test/t/index_merge_innodb.test
index b7b2e60f20b..31ca1c253e4 100644
--- a/mysql-test/t/index_merge_innodb.test
+++ b/mysql-test/t/index_merge_innodb.test
@@ -14,7 +14,12 @@
 --source include/not_staging.inc
 --source include/have_xtradb.inc
 
-let $engine_type= InnoDB;
+connect disable_purge,localhost,root,,;
+--echo # Disable the purge of InnoDB history, to make the test run faster.
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+connection default;
+
+SET STORAGE_ENGINE = InnoDB;
 # InnoDB does not support Merge tables (affects include/index_merge1.inc)
 let $merge_table_support= 0;
 
@@ -37,7 +42,9 @@ set optimizer_switch='index_merge_sort_intersection=off';
 --echo # 
 --echo # BUG#56862/640419: Wrong result with sort_union index merge when one
 --echo #                   of the merged index scans is the primary key scan
---echo # 
+--echo #
+
+CREATE TABLE t0(a int, b int) ENGINE=MyISAM;
 
 CREATE TABLE t1 (
   pk int NOT NULL AUTO_INCREMENT PRIMARY KEY,
@@ -46,27 +53,19 @@ CREATE TABLE t1 (
   INDEX idx(a))
 ENGINE=INNODB;
 
-begin;
-INSERT INTO t1(a,b) VALUES
+INSERT INTO t0(a,b) VALUES
   (11, 1100), (2, 200), (1, 100), (14, 1400), (5, 500),
   (3, 300), (17, 1700), (4, 400), (12, 1200), (8, 800),
   (6, 600), (18, 1800), (9, 900), (10, 1000), (7, 700),
   (13, 1300), (15, 1500), (19, 1900), (16, 1600), (20, 2000);
-INSERT INTO t1(a,b) SELECT a+20, b+2000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+40, b+4000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+80, b+8000 FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
+INSERT INTO t0(a,b) SELECT a+20, b+2000 FROM t0;
+INSERT INTO t0(a,b) SELECT a+40, b+4000 FROM t0;
+INSERT INTO t0(a,b) SELECT a+80, b+8000 FROM t0;
+begin;
+INSERT INTO t1(a,b) SELECT t0.a,t0.b FROM t0, seq_1_to_1024;
 INSERT INTO t1 VALUES (1000000, 0, 0);
 commit;
+DROP TABLE t0;
 
 SET SESSION sort_buffer_size = 1024*36;
 set @tmp_optimizer_switch=@@optimizer_switch;
@@ -130,9 +129,6 @@ DROP TABLE t1;
 --echo # BUG#1006164: Multi-table DELETE that uses innodb + index_merge/intersect may fail to delete rows
 --echo #
 
-create table t0(a int);
-insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
-
 create table t1 (
   pk int auto_increment, 
   zone_id int,
@@ -142,7 +138,7 @@ create table t1 (
   key (modified)
 ) engine=innodb;
 
-insert into t1 (zone_id, modified) select 0,0 from t0 A, t0 B, t0 C, t0 D;
+insert into t1 (zone_id, modified) select 0,0 from seq_1_to_10000;
 update t1 set zone_id=487, modified=9 where pk=7259;
 update t1 set zone_id=487, modified=9 where pk=7260;
 update t1 set zone_id=830, modified=9 where pk=8434;
@@ -156,7 +152,7 @@ DELETE t1 FROM t1 WHERE t1.zone_id=830 AND modified=9;
 commit;
 select * from t1 where t1.zone_id=830 AND modified=9;
 
-drop table t0, t1;
+drop table t1;
 
 --echo #
 --echo # MDEV-376: Wrong result (missing rows) with index_merge+index_merge_intersection, join
@@ -196,14 +192,10 @@ KEY key1 (key1),
 KEY key2 (key2)
 ) ENGINE=InnoDB AUTO_INCREMENT=12860259 DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT;
 
-create table t2(a int);
-insert into t2 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
-
-create table t3(a int);
-insert into t3 select A.a + B.a* 10 + C.a * 100 + D.a*1000 from t2 A, t2 B, t2 C, t2 D;
-
 insert into t1 (key1, key2, col1,col2,col3,col4)
-select  a,a, a,a,a,a from t3;
+select seq,seq,seq,seq,seq,seq from seq_1_to_10000;
 SELECT sum(col1) FROM t1 FORCE INDEX (key1,key2) WHERE  (key1 between 10 and 8191+10) or (key2= 5);
-drop table t1,t2,t3;
+drop table t1;
 set optimizer_switch=@tmp_optimizer_switch;
+
+disconnect disable_purge;
diff --git a/mysql-test/t/index_merge_myisam.test b/mysql-test/t/index_merge_myisam.test
index 75beb9bd883..2cee768706b 100644
--- a/mysql-test/t/index_merge_myisam.test
+++ b/mysql-test/t/index_merge_myisam.test
@@ -10,7 +10,7 @@
 #               include/index_merge*.inc files
 #
 
-let $engine_type= MyISAM;
+SET STORAGE_ENGINE = MyISAM;
 # MyISAM supports Merge tables
 let $merge_table_support= 1;
 
@@ -33,7 +33,7 @@ insert into t1 select
   A.a * B.a*10 + C.a*100,
   A.a, 
   'filler'
-from t0 A, t0 B, t0 C; 
+from t0 A, t0 B, t0 C;
 
 --echo This should use union:
 explain select * from t1 where a=1 or b=1;
@@ -253,15 +253,7 @@ create table t0
   INDEX i1(key1)
 );
 
-insert into t0 values (1),(2),(3),(4),(5),(6),(7),(8);
-let $1=7;
-set @d=8;
-while ($1)
-{
-  eval insert into t0 select key1+ @d from t0;
-  eval set @d=@d*2;
-  dec $1;
-}
+insert into t0 select * from seq_1_to_1024;
 alter table t0 add key2 int not null, add index i2(key2);
 alter table t0 add key3 int not null, add index i3(key3);
 alter table t0 add key8 int not null, add index i8(key8);