TABLE LOCK table `test`.`emp` trx id 4663 lock mode IX ## 在给主键行上加X锁之前,先要在表上加意向锁IX RECORD LOCKS space id 16 page no 3 n bits 88 index `PRIMARY` of table `test`.`emp` trx id 4663 lock_mode X locks rec but not gap waiting Record lock, heap no 9 PHYSICAL ...
lock_index: `GEN_CLUST_INDEX` lock_space: 0 lock_page: 32777 lock_rec: 2 lock_data: 0x000000640000 *** 2. row *** lock_id: B14:0:32777:2 lock_trx_id: B14 lock_mode: X lock_type: RECORD lock_table: `test`.`john` lock_index: `GEN_CLUST_INDEX` lock_space: 0 lock_page: ...
[mysqld]performance-schema-instrument='wait/lock/table/sql/handler=OFF' To control table lock instrumentation state at runtime, update thesetup_instrumentstable: Enable: UPDATEperformance_schema.setup_instrumentsSETENABLED='YES',TIMED='YES'WHERENAME='wait/lock/table/sql/handler'; ...
LOCK TABLES account_data.accountREAD;SELECTSLEEP(160); UNLOCK TABLES account_data.account; 另开启一个会话检查锁表情况: mysql>showOPENTABLESwhereIn_use>0;+---+---+---+---+|Database|Table|In_use|Name_locked|+---+---+---+---+|account_data|account|1|0|+---+---+---+---+1...
当前会话(会话ID为61)持有test表的READ锁后,那么当前会话只可以读该表,而不能往表中写入数据,否则就会报“Table 'test' was locked with a READ lock and can't be updated”这样的错误。 注意:如果使用LOCK TABLE WRITE锁定表后,则可以更新数据。详见后面介绍 ...
lock table 表名称 read(write),表名称2 read(write),其他; 查看表锁情况: show open tables; 删除表锁: unlock tables; 表锁演示 环境准备 CREATE TABLE mylock ( id int(11) NOT NULL AUTO_INCREMENT, NAME varchar(20) DEFAULT NULL, PRIMARY KEY (id) ...
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其它会话也能查询表test,但是不能修改表,如果执行DML操作的话,则会一直处于被阻塞状态(Waiting for table metadata lock)。 另外,我们测试一下修饰符LOCAL的用途,如下所示: mysql> create table test2( id int , name varchar(12)) engine=MyISAM; Query OK, 0 rows affected (0.05 sec) mysql> insert into...
Table Lock Acquisition To acquire table locks within the current session, use the LOCK TABLES statement, which acquires metadata locks (see Section 10.11.4, “Metadata Locking”). The following lock types are available: READ [LOCAL] lock: The session that holds the lock can read the ...
statements (concurrent inserts) by other sessions to execute while the lock is held. (See Section...