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drop table if exists t1,t2;
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
unlock tables;
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;
unlock tables;
ERROR 42S02: Table 'test.t2' doesn't exist
drop table t1;
create table t1 (a int);
create table t2 (a int);
lock table t1 write, t2 write, t1 as t1_2 write, t2 as t2_2 write;
insert t1 select * from t2;
drop table t2;
unlock tables;
ERROR 42S02: Table 'test.t2' doesn't exist
drop table t1;
End of 4.1 tests
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;
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);
ERROR HY000: Table 't2' was not locked with LOCK TABLES
UNLOCK TABLES;
UNLOCK TABLES;
DROP TABLE t1;
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 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
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;
unlock tables;
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;
End of 5.0 tests
create table t1 (i int);
lock table t1 read;
update t1 set i= 10;
select * from t1;
Timeout in wait_condition.inc for select count(*) = 1 from information_schema.processlist
where state = "Table Lock" and info = "select * from t1"
kill query ID;
i
ERROR 70100: Query execution was interrupted
unlock tables;
drop table t1;
drop table if exists t1;
create table t1 (i int);
connection: default
lock tables t1 write;
connection: flush
flush tables with read lock;;
connection: default
alter table t1 add column j int;
connection: insert
insert into t1 values (1,2);;
connection: default
unlock tables;
connection: flush
select * from t1;
i j
unlock tables;
select * from t1;
i j
1 2
drop table t1;
drop table if exists t1;
create table t1 (i int);
connection: default
lock tables t1 write;
connection: flush
flush tables with read lock;;
connection: default
flush tables;
unlock tables;
drop table t1;
drop table if exists t1,t2;
create table t1 (a int);
flush status;
lock tables t1 read;
insert into t1 values(1);
unlock tables;
drop table t1;
select @tlwa < @tlwb;
@tlwa < @tlwb
1
End of 5.1 tests
drop database pbxt;
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