mysql 锁表与解锁

show processlist;
kill 6924
show full processlist;  #列出全部进程
select * from information_schema.PROCESSLIST t;
kill 6911
SELECT * FROM information_schema.innodb_trx ORDER BY trx_started ;
SELECT * FROM information_schema.innodb_locks;
SELECT * FROM information_schema.innodb_trx t where t.trx_state = 'LOCK WAIT';
select * from information_schema.PROCESSLIST t where t.id = {lock_trx_id}

#状态一直在休眠，关闭事件调节器[7]：
SET GLOBAL event_scheduler = OFF;
 #查看是否开启定时器
SHOW  VARIABLES  LIKE 'event_scheduler'; SHOW  VARIABLES  LIKE
'event_scheduler';   #查看是否开启定时器

MYSQL 解锁与锁表和批解锁

第一种

show processlist;

找到锁进程，kill id ;

第二种

mysql>UNLOCK TABLES;

锁表

锁定数据表，避免在备份过程中，表被更新

mysql>LOCK TABLES tbl_name READ;

为表增加一个写锁定：

mysql>LOCK TABLES tbl_name WRITE;

查询是否锁表

show OPEN TABLES where In_use > 0;

SHOW OPEN TABLES;

// 解锁

UNLOCK TABLES;

查看表的状态

SHOW STATUS LIKE 'table%';

SHOW STATUS LIKE 'innodb_row_lock%';

第三种

SELECT concat('KILL ',id,';') FROM information_schema.processlist WHERE
user='root';

KILL 755;

KILL 756;

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