show processlist和show full processlist
processlist命令的输出结果显示了有哪些线程在运行,不仅可以查看当前所有的连接数,还可以查看当前的连接状态帮助识别出有问题的查询语句等.
如果是root帐号,能看到所有用户的当前连接.如果是其他普通帐号,则只能看到自己占用的连接.showprocesslist只能列出当前100条.如果想全部列出,可以使用SHOW FULL PROCESSLIST命令
mysql> show processlist;
+----+------+--------------------+------+---------+-------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+--------------------+------+---------+-------+-------+------------------+
| 1 | root | localhost | NULL | Sleep | 12 | | NULL |
| 2 | root | 192.168.100.1:7437 | test | Sleep | 8035 | | NULL |
| 3 | root | 192.16⑧100.1:7438 | NULL | Sleep | 24348 | | NULL |
| 5 | root | 192.168.100.1:7443 | NULL | Sleep | 24317 | | NULL |
| 7 | root | 192.16⑧100.1:7450 | test | Sleep | 24272 | | NULL |
| 9 | root | 192.168.100.1:5152 | test | Query | 0 | init | show processlist |
+----+------+--------------------+------+---------+-------+-------+------------------+
6 rows in set
mysql> show full processlist;
+----+------+--------------------+------+---------+-------+-------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+--------------------+------+---------+-------+-------+-----------------------+
| 1 | root | localhost | NULL | Sleep | 19 | | NULL |
| 2 | root | 192.16⑧100.1:7437 | test | Sleep | 8042 | | NULL |
| 3 | root | 192.168.100.1:7438 | NULL | Sleep | 24355 | | NULL |
| 5 | root | 192.16⑧100.1:7443 | NULL | Sleep | 24324 | | NULL |
| 7 | root | 192.168.100.1:7450 | test | Sleep | 24279 | | NULL |
| 9 | root | 192.16⑧100.1:5152 | test | Query | 0 | init | show full processlist |
+----+------+--------------------+------+---------+-------+-------+-----------------------+
6 rows in set
各个列的含义：
在主从复制环境中,show processlist或show full processlist对于判断状态很有帮助,例如下面的state列：
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