path: root/mysql-test/main/flush.test

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
connection con1;

--disable_warnings
drop table if exists t1,t2;
drop database if exists mysqltest;
--enable_warnings

create temporary table t1(n int not null primary key);
create table t2(n int);
insert into t2 values(3);
let $1=100;
disable_query_log;
while ($1)
{
 connection con1;
 send replace into t1 select n from t2;
 connection con2;
 send flush tables;
 connection con1;
 reap;
 connection con2;
 reap;
 dec $1;
}
enable_query_log;
connection con1;
select * from t1;
connection con2;
flush tables with read lock and disable checkpoint;
--error 1223
drop table t2;
connection con1;
send drop table t2;
connection con2;
unlock tables;
connection con1;
reap;

#test if drop database will wait until we release the global read lock
connection con1;
create database mysqltest;
create table mysqltest.t1(n int);
insert into mysqltest.t1 values (23);
flush tables with read lock;
connection con2;
send drop database mysqltest;
connection con1;
select * from mysqltest.t1;
unlock tables;
connection con2;
reap;

# test if dirty close releases global read lock
connection con1;
create table t1 (n int);
flush tables with read lock;
dirty_close con1;
connection con2;
insert into t1 values (345);
select * from t1;
drop table t1;

#
# Bug#9459 - deadlock with flush with lock, and lock table write
#
create table t1 (c1 int);
lock table t1 write;
# Cannot get the global read lock with write locked tables.
--error ER_LOCK_OR_ACTIVE_TRANSACTION 
flush tables with read lock;
lock table t1 read;
# Cannot get the global read lock with read locked tables.
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables with read lock;
unlock tables;
flush tables with read lock;
--error 1223
lock table t1 write;
lock table t1 read;
--error 1223
lock table t1 write;
# Release all table locks and the global read lock.
unlock tables;
create table t2 (c1 int);
create table t3 (c1 int);
lock table t1 read, t2 read, t3 write;
# Cannot get the global read lock with write locked tables.
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables with read lock;
lock table t1 read, t2 read, t3 read;
# Cannot get the global read lock with read locked tables.
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables with read lock;
unlock tables;
drop table t1, t2, t3;

# End of 4.1 tests

#
# Test of deadlock problem when doing FLUSH TABLE with read lock
# (Bug was in NTPL threads in Linux when using different mutex while
#  waiting for a condtion variable)

create table t1 (c1 int);
create table t2 (c1 int);

connect (con1,localhost,root,,);
connect (con3,localhost,root,,);

connection con1;
lock table t1 write;

connection con2;
send flush tables with read lock;
--sleep 1

connection con3;
send insert into t2 values(1);
--sleep 1

connection con1;
unlock tables;
disconnect con1;

connection con2;
reap;
disconnect con2;

connection con3;
# It hangs here (insert into t2 does not end).
reap;
disconnect con3;

connection default;
drop table t1, t2;

#
# Bug#32528 Global read lock with a low priority write lock causes a server crash
#

--disable_warnings
drop table if exists t1, t2;
--enable_warnings

set session low_priority_updates=1;

create table t1 (a int);
create table t2 (b int);

lock tables t1 write;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables with read lock;
unlock tables;

lock tables t1 read, t2 write;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables with read lock;
unlock tables;

lock tables t1 read;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables with read lock;
unlock tables;

drop table t1, t2;

set session low_priority_updates=default;

#
# Bug #33334 mysqltest_embedded crashes when disconnecting before reap
#

connect (con1,localhost,root,,);
send select benchmark(200, (select sin(1))) > 1000;
disconnect con1;
--source include/wait_until_disconnected.inc
connection default;

--echo End of 5.0 tests

#
# Bug #26380: LOCK TABLES + FLUSH LOGS causes deadlock
#
set @old_general_log= @@general_log;
set @old_read_only= @@read_only;
set global general_log= on;

flush tables with read lock;
flush logs;
unlock tables;

set global read_only=1;
flush logs;
unlock tables;

flush tables with read lock;
flush logs;
unlock tables;

set global general_log= @old_general_log;
set global read_only= @old_read_only;

--echo End of 5.1 tests


--echo #
--echo # Additional test for bug #51136 "Crash in pthread_rwlock_rdlock
--echo #                                 on TEMPORARY + HANDLER + LOCK + SP".
--echo # Also see the main test for this bug in include/handler.inc.
--echo #
--disable_warnings
drop tables if exists t1, t2;
--enable_warnings
create table t1 (i int);
create temporary table t2 (j int);
flush tables with read lock;
lock table t2 read;
--echo # This commit should not release any MDL locks.
commit;
--echo # The below statement crashed before the bug fix as it
--echo # has attempted to release global shared metadata lock
--echo # which was already released by commit.
unlock tables;
drop tables t1, t2;



--echo # 
--echo # Tests for WL#5000  FLUSH TABLES|TABLE table_list WITH READ LOCK
--echo #
--echo # I. Check the incompatible changes in the grammar.
--echo #
--error ER_PARSE_ERROR
flush tables with read lock, hosts;
--error ER_PARSE_ERROR
flush privileges, tables;
--error ER_PARSE_ERROR
flush privileges, tables with read lock;
--error ER_PARSE_ERROR
flush privileges, tables;
--error ER_PARSE_ERROR
flush tables with read lock, tables;
show tables;
--echo #
--echo # II. Check the allowed syntax.
--echo #
--disable_warnings
drop table if exists t1, t2, t3;
--enable_warnings
create table t1 (a int);
create table t2 (a int);
create table t3 (a int);
lock table t1 read, t2 read;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables with read lock;
unlock tables;
flush tables with read lock;
flush tables t1, t2 with read lock;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables t1, t2 with read lock;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
flush tables with read lock;
select * from t1;
select * from t2;
--error ER_TABLE_NOT_LOCKED
select * from t3;
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
insert into t1 (a) values (1);
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
insert into t2 (a) values (1);
--error ER_TABLE_NOT_LOCKED
insert into t3 (a) values (1);
--error ER_NO_SUCH_TABLE
lock table no_such_table read;
--echo #
--echo # We implicitly left the locked tables
--echo # mode but still have the read lock.
--echo # 
--error ER_CANT_UPDATE_WITH_READLOCK
insert into t2 (a) values (1);
unlock tables;
insert into t1 (a) values (1);
insert into t2 (a) values (1);
flush table t1, t2 with read lock;
select * from t1;
select * from t2;
--error ER_TABLE_NOT_LOCKED
select * from t3;
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
insert into t1 (a) values (2);
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
insert into t2 (a) values (2);
--error ER_TABLE_NOT_LOCKED
insert into t3 (a) values (2);
--error ER_NO_SUCH_TABLE
lock table no_such_table read;
insert into t3 (a) values (2);


--echo # 
--echo # III. Concurrent tests.
--echo #
connect (con1,localhost,root,,);
--echo #
--echo # Check that flush tables <list> with read lock
--echo # does not affect non-locked tables.
connection default;
--echo #
flush tables t1 with read lock;
connection con1;
select * from t1;
select * from t2;
insert into t2 (a) values (3);
connection default;
unlock tables;
--echo #
--echo # Check that "FLUSH TABLES <list> WITH READ LOCK" is
--echo # compatible with active "FLUSH TABLES WITH READ LOCK".
--echo # Vice versa it is not true, since tables read-locked by
--echo # "FLUSH TABLES <list> WITH READ LOCK" can't be flushed.
flush tables with read lock;
connection con1;
flush table t1 with read lock;
select * from t1;
unlock tables;
connection default;
unlock tables;
--echo #
--echo # Check that FLUSH TABLES t1 WITH READ LOCK
--echo # does not conflict with an existing FLUSH TABLES t2
--echo # WITH READ LOCK.
--echo #
flush table t1 with read lock;
connection con1;
flush table t2 with read lock;
unlock tables;
connection default;
unlock tables;
--echo #
--echo # Check that FLUSH TABLES t1 WITH READ LOCK
--echo # does not conflict with SET GLOBAL read_only=1.
--echo #
set global read_only=1;
connection con1;
flush table t1 with read lock;
unlock tables;
connection default;
set global read_only=0;
--echo #
--echo # Check that it's possible to read-lock 
--echo # tables locked with FLUSH TABLE <list> WITH READ LOCK.
--echo #
flush tables t1, t2 with read lock;
connection con1;
lock table t1 read, t2 read;
unlock tables;
connection default;
unlock tables;

connection con1;
disconnect con1;
--source include/wait_until_disconnected.inc
connection default;
drop table t1, t2, t3;

--echo #
--echo # Bug#51710 FLUSH TABLES <view> WITH READ LOCK kills the server
--echo #
--disable_warnings
drop view if exists v1, v2, v3;
drop table if exists t1, v1;
--enable_warnings
create table t1 (a int);
create view v1 as select 1;
create view v2 as select * from t1;
create view v3 as select * from v2;

--error ER_WRONG_OBJECT
flush table v1, v2, v3 with read lock;
--error ER_WRONG_OBJECT
flush table v1 with read lock;
--error ER_WRONG_OBJECT
flush table v2 with read lock;
--error ER_WRONG_OBJECT
flush table v3 with read lock;
create temporary table v1 (a int);
--error ER_WRONG_OBJECT
flush table v1 with read lock;
drop view v1;
create table v1 (a int);
flush table v1 with read lock;
drop temporary table v1;
unlock tables;
drop view v2, v3;
drop table t1, v1;


--echo # 
--echo # FLUSH TABLES <list> WITH READ LOCK and HANDLER
--echo # 
--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (a int, key a (a));
insert into t1 (a) values (1), (2), (3);
handler t1 open;
handler t1 read a next;
handler t1 read a next;
flush tables t1 with read lock;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
handler t1 read a next;
unlock tables;
handler t1 read a next;
handler t1 close;
drop table t1;

--echo #
--echo # Bug#52117 Pending FLUSH TALBES <list> aborts
--echo # transactions unnecessarily.
--echo #
--disable_warnings
drop table if exists t1;
--enable_warnings
connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
connection default;

create table t1 (a int);
begin;
select * from t1;
connection con1;
--echo # 
--echo # Issue a LOCK TABLE t1 READ. We could use HANDLER t1 OPEN
--echo # or a long-running select -- anything that
--echo # prevents FLUSH TABLE t1 from immediate completion would do.
--echo #
lock table t1 read;
connection con2;
--echo #
--echo # FLUSH TABLE expels the table definition from the cache.
--echo # Sending 'flush table t1'...
send flush table t1;
connection default;
--echo # Let flush table sync in.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for table metadata lock"
  and info = "flush table t1";
--source include/wait_condition.inc
select * from t1;
connection con1;
select * from t1;
unlock tables;
connection default;
select count(*) from information_schema.processlist where state = "Waiting for table metadata lock";
commit;
connection con2;
--echo # Reaping 'flush table t1'...
reap;
connection default;

--echo #
--echo # Repeat the same test but with FLUSH TABLES
--echo #

begin;
select * from t1;
connection con1;
--echo # 
--echo # Issue a LOCK TABLE t1 READ.
--echo #
lock table t1 read;
connection con2;
send flush tables;
connection default;
select * from t1;
connection con1;
select * from t1;
unlock tables;
connection con2;
--echo # Reaping 'flush tables'...
reap;
connection default;
commit;

--echo # Cleanup

connection con1;
disconnect con1;
--source include/wait_until_disconnected.inc
connection con2;
disconnect con2;
--source include/wait_until_disconnected.inc
connection default;
drop table t1;


--echo #
--echo # Test for bug #55273 "FLUSH TABLE tm WITH READ LOCK for Merge table
--echo #                      causes assert failure".
--echo #
--disable_warnings
drop table if exists t1, t2, tm;
--enable_warnings
create table t1 (i int);
create table t2 (i int);
create table tm (i int) engine=merge union=(t1, t2);
insert into t1 values (1), (2);
insert into t2 values (3), (4);
--echo # The below statement should succeed and lock merge
--echo # table for read. Only merge table gets flushed and
--echo # not underlying tables.
flush tables tm with read lock;
select * from tm;
--echo # Check that underlying tables are locked.
select * from t1;
select * from t2;
unlock tables;
--echo # This statement should succeed as well and flush
--echo # all tables in the list.
flush tables tm, t1, t2 with read lock;
select * from tm;
--echo # Naturally, underlying tables should be locked in this case too.
select * from t1;
select * from t2;
unlock tables;
drop tables tm, t1, t2;


--echo #
--echo # Test for bug #57006 "Deadlock between HANDLER and
--echo #                      FLUSH TABLES WITH READ LOCK".
--echo #
--disable_warnings
drop table if exists t1, t2;
--enable_warnings
connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
connection default;
create table t1 (i int);
create table t2 (i int);
handler t1 open;

connection con1;
flush tables with read lock;
connection default;
--echo # The below statement should not cause deadlock.
--echo # Sending:
--send insert into t2 values (1)

connection con2;
--echo # Wait until INSERT starts to wait for FTWRL to go away.
let $wait_condition=
  select count(*) = 1 from information_schema.processlist
  where state = "Waiting for backup lock"
  and info = "insert into t2 values (1)";
--source include/wait_condition.inc

connection con1;
unlock tables;

connection default;
--echo # Reap INSERT.
--reap
handler t1 close;

--echo # Cleanup.
connection con1;
disconnect con1;
--source include/wait_until_disconnected.inc
connection con2;
disconnect con2;
--source include/wait_until_disconnected.inc
connection default;
drop tables t1, t2;


--echo #
--echo # Bug#57649 FLUSH TABLES under FLUSH TABLES <list> WITH READ LOCK leads
--echo #           to assert failure.
--echo #

--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings

CREATE TABLE t1 (a INT);
FLUSH TABLES t1 WITH READ LOCK;

# All these triggered the assertion
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
FLUSH TABLES;
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
CREATE TRIGGER t1_bi BEFORE INSERT ON t1 FOR EACH ROW SET @a= 1;
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
ALTER TABLE t1 COMMENT 'test';

UNLOCK TABLES;
DROP TABLE t1;


--echo #
--echo # Test for bug #12641342 - "61401: UPDATE PERFORMANCE DEGRADES
--echo #                           GRADUALLY IF A TRIGGER EXISTS".
--echo #
--echo # One of side-effects of this bug was that a transaction which
--echo # involved DML statements requiring prelocking blocked concurrent
--echo # FLUSH TABLES WITH READ LOCK for the whole its duration, while
--echo # correct behavior in this case is to block FTWRL only for duration
--echo # of individual DML statements.
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
CREATE TABLE t1 (id INT PRIMARY KEY, value INT);
INSERT INTO t1 VALUES (1, 1);
CREATE TRIGGER t1_au AFTER UPDATE ON t1 FOR EACH ROW SET @var = "a";
BEGIN;
UPDATE t1 SET value= value + 1 WHERE id = 1;

connect(con1, localhost, root);
--echo # The below FLUSH TABLES WITH READ LOCK should succeed and
--echo # should not be blocked by the transaction in default connection.
FLUSH TABLES WITH READ LOCK;
UNLOCK TABLES;
disconnect con1;
--source include/wait_until_disconnected.inc

connection default;
COMMIT;
DROP TABLE t1;

--echo #
--echo # Test flushing slave or relay logs twice
--echo #
--error ER_WRONG_USAGE
flush relay logs,relay logs;
--error ER_WRONG_USAGE
flush slave,slave;

--echo #
--echo # MDEV-15890 Strange error message if you try to
--echo #     FLUSH TABLES <view> after LOCK TABLES <view>.
--echo #

CREATE TABLE t1 (qty INT, price INT);
CREATE VIEW v1 AS SELECT qty, price, qty*price AS value FROM t1;

LOCK TABLES v1 READ;
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
FLUSH TABLES v1;
UNLOCK TABLES;

LOCK TABLES v1 WRITE;
FLUSH TABLES v1;
UNLOCK TABLES;

LOCK TABLES v1 READ;
--error ER_TABLE_NOT_LOCKED_FOR_WRITE
FLUSH TABLES t1;
UNLOCK TABLES;

LOCK TABLES t1 READ;
--error ER_TABLE_NOT_LOCKED
FLUSH TABLES v1;
UNLOCK TABLES;

DROP VIEW v1;
DROP TABLE t1;

--echo #
--echo # Test FLUSH THREADS
--echo #

flush threads;
show status like "Threads_cached";