drop table if exists t1,t2;
create table t1(n int);
insert into t1 values (1);
lock tables t1 write;
update low_priority t1 set n = 4;
select n from t1;
unlock tables;
n
4
drop table t1;
create table t1(n int);
insert into t1 values (1);
lock tables t1 read;
update low_priority t1 set n = 4;
select n from t1;
unlock tables;
n
1
drop table t1;
create table t1 (a int, b int);
create table t2 (c int, d int);
insert into t1 values(1,1);
insert into t1 values(2,2);
insert into t2 values(1,2);
lock table t1 read;
update t1,t2 set c=a where b=d;
select c from t2;
c
2
drop table t1;
drop table t2;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write;
insert t1 select * from t2;
drop table t2;
ERROR 42S02: Table 'test.t2' doesn't exist
drop table t1;
create table t1(a int);
lock tables t1 write;
show columns from t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
unlock tables;
drop table t1;
CREATE DATABASE mysqltest_1;
FLUSH TABLES WITH READ LOCK;
DROP DATABASE mysqltest_1;
DROP DATABASE mysqltest_1;
ERROR HY000: Can't execute the query because you have a conflicting read lock
UNLOCK TABLES;
DROP DATABASE mysqltest_1;
ERROR HY000: Can't drop database 'mysqltest_1'; database doesn't exist
USE mysql;
LOCK TABLES columns_priv WRITE, db WRITE, host WRITE, user WRITE;
FLUSH TABLES;
USE mysql;
SELECT user.Select_priv FROM user, db WHERE user.user = db.user LIMIT 1;
OPTIMIZE TABLES columns_priv, db, host, user;
Table	Op	Msg_type	Msg_text
mysql.columns_priv	optimize	status	OK
mysql.db	optimize	status	OK
mysql.host	optimize	status	OK
mysql.user	optimize	status	OK
UNLOCK TABLES;
Select_priv
N
USE test;
use test;
CREATE TABLE t1 (c1 int);
LOCK TABLE t1 WRITE;
FLUSH TABLES WITH READ LOCK;
CREATE TABLE t2 (c1 int);
UNLOCK TABLES;
UNLOCK TABLES;
DROP TABLE t1, t2;
CREATE TABLE t1 (c1 int);
LOCK TABLE t1 WRITE;
FLUSH TABLES WITH READ LOCK;
CREATE TABLE t2 AS SELECT * FROM t1;
ERROR HY000: Table 't2' was not locked with LOCK TABLES
UNLOCK TABLES;
UNLOCK TABLES;
DROP TABLE t1;
create table t1 (f1 int(12) unsigned not null auto_increment, primary key(f1)) engine=innodb;
lock tables t1 write;
alter table t1 auto_increment=0; alter table t1 auto_increment=0; alter table t1 auto_increment=0; alter table t1 auto_increment=0; alter table t1 auto_increment=0; //
alter table t1 auto_increment=0; alter table t1 auto_increment=0; alter table t1 auto_increment=0; alter table t1 auto_increment=0; alter table t1 auto_increment=0; //
unlock tables;
drop table t1;
drop table if exists t1;
create table t1 (a int);
connection: locker
lock tables t1 read;
connection: writer
create table t2 like t1;
connection: default
kill query
ERROR 70100: Query execution was interrupted
unlock tables;
drop table t1;
CREATE TABLE t1 (
a int(11) unsigned default NULL,
b varchar(255) default NULL,
UNIQUE KEY a (a),
KEY b (b)
);
INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3);
CREATE TABLE t2 SELECT * FROM t1;
CREATE TABLE t3 SELECT * FROM t1;
# test altering of columns that multiupdate doesn't use
# normal mode
# PS mode
# test altering of columns that multiupdate uses
# normal mode
# PS mode
DROP TABLE t1, t2, t3;
CREATE TABLE t1( a INT, b INT );
INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4);
# 1. test regular tables
# 1.1. test altering of columns that multiupdate doesn't use
# 1.1.1. normal mode
# 1.1.2. PS mode
# 1.2. test altering of columns that multiupdate uses
# 1.2.1. normal mode
# 1.2.2. PS mode
ALTER TABLE t1 ADD COLUMN a INT;
# 2. test UNIONs
# 2.1. test altering of columns that multiupdate doesn't use
# 2.1.1. normal mode
# 2.1.2. PS mode
# 2.2. test altering of columns that multiupdate uses
# 2.2.1. normal mode
# 2.2.2. PS mode
DROP TABLE t1;
create table t1 (a int);
create table t2 like t1;
# con1
lock tables t1 write;
# con2
flush tables with read lock;
# con5
# global read lock is taken
# con3
select * from t2 for update;
# waiting for release of read lock
# con4
# would hang and later cause a deadlock
flush tables t2;
# clean up
unlock tables;
unlock tables;
a
drop table t1,t2;
#
# Lightweight version:
# Ensure that the wait for a GRL is done before opening tables.
#
create table t1 (a int);
create table t2 like t1;
#
# UPDATE
#
# default
flush tables with read lock;
# con1
update t2 set a = 1;
# default
# statement is waiting for release of read lock
# con2
flush table t2;
# default
unlock tables;
# con1
#
# LOCK TABLES .. WRITE
#
# default
flush tables with read lock;
# con1
lock tables t2 write;
# default
# statement is waiting for release of read lock
# con2
flush table t2;
# default
unlock tables;
# con1
unlock tables;
drop table t1,t2;
