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 复制代码 代码如下: 以下为引用的内容： mysql status; -------------- mysql Ver 11.18 Distrib 3.23.58, for redhat-linux-g
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复制代码 代码如下:以下为引用的内容：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 |+----+------+-----------+------+---------+------+-------+------------------+
