MySQL如何查询当前正在运行的SQL语句
作者: zhaolinjnu, 出处:IT专家网, 责任编辑: 李书琴,
2008-04-21 08:30
MySQL如何查询当前正在运行的SQL语句介绍。
通过status命令，查看Slow queries这一项，如果值长时间>0,说明有查询执行时间过长
| 以下是引用片段： mysql> status; -------------- mysql Ver 11.18 Distrib 3.23.58, for redhat-linux-gnu (i386) Connection id: 53 Current database: (null) Current user: root@localhost Current pager: stdout Using outfile: '' Server version: 5.0.37-log Protocol version: 10 Connection: Localhost via UNIX socket Client characterset: latin1 Server characterset: latin1 UNIX socket: /tmp/mysql.sock Uptime: 4 days 16 hours 49 min 57 sec Threads: 1 Questions: 706 Slow queries: 0 Opens: 177 Flush tables: 1 Open tables: 52 Queries per second avg: 0.002 -------------- |
这时再通过show processlist命令来查看当前正在运行的SQL，从中找出运行慢的SQL语句，找到执行慢的语句后，再用explain命令查看这些语句的执行计划。
mysql> show processlist;
+----+------+-----------+------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+-----------+------+---------+------+-------+------------------+
| 53 | root | localhost | NULL | Query | 0 | NULL | show processlist |
+----+------+-----------+------+---------+------+-------+------------------+
1 row in set (0.00 sec)
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