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MySQL锁检测-kill
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RECORD LOCKS space id 122 page no 3 n bits 80 index `PRIMARY` of table `test`.`t` trx id 307463 lock_mode X
RECORD LOCKS space id 122 page no 4 n bits 80 index `idx_name` of table `test`.`t` trx id 307463 lock_mode X
RECORD LOCKS space id 122 page no 4 n bits 80 index `idx_name` of table `test`.`t` trx id 307463 lock_mode X locks gap before rec
mysql> show processlist; +------+------+---------------------+------+-------------+-------+-----------------------------------------------------------------------+------------------+-----------+---------------+ | Id | User | Host | db | Command | Time | State | Info | Rows_sent | Rows_examined | +------+------+---------------------+------+-------------+-------+-----------------------------------------------------------------------+------------------+-----------+---------------+ | 4256 | root | localhost | test | Sleep | 72573 | | NULL | 7 | 7 | | 4375 | repl | 172.16.52.131:49285 | NULL | Binlog Dump | 75947 | Master has sent all binlog to slave; waiting for binlog to be updated | NULL | 0 | 0 | | 5294 | root | localhost | test | Sleep | 72553 | | NULL | 0 | 0 | | 9060 | root | localhost | test | Query | 0 | init | show processlist | 0 | 0 | | 9289 | root | localhost | NULL | Sleep | 40 | | NULL | 0 | 0 | +------+------+---------------------+------+-------------+-------+-----------------------------------------------------------------------+------------------+-----------+---------------+ 5 rows in set (0.00 sec) |
mysql> select * from t; +----+----------+------+ | i | name | age | +----+----------+------+ | 1 | zhangsna | 20 | | 2 | zhangsna | 20 | | 3 | c | 23 | | 4 | c | 23 | | 5 | e | NULL | | 6 | f | NULL | | 19 | xiaoming | 23 | +----+----------+------+ 7 rows in set (0.00 sec) |
判断:
通过innodb status发现对t表上了表锁:TABLE LOCK table `test`.`t` trx id 307463 lock mode IX
通过select * from t发现该表有7行:7 rows in set (0.00 sec)
通过show processlist发现有一个会话的Rows_sent | Rows_examined为7 7 ,ID为4526
通过判断kill掉id为4526会话:
mysql> kill 4256; Query OK, 0 rows affected (0.00 sec) |
在执行delete操作,顺利执行:
mysql> delete from t; Query OK, 7 rows affected (0.01 sec) |
本文出自 “浮生凤年” 博客,请务必保留此出处http://liuzhanbin.blog.51cto.com/10060150/1647320
MySQL锁检测-kill
标签:锁
本文系统来源:http://liuzhanbin.blog.51cto.com/10060150/1647320
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