查看Slow queries这
项如果值长时间>0,介绍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
Client character
: latin1Server character
: latin1UNIX
: /tmp/mysql.sockUptime: 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
SQL从中找出运行慢SQL语句找到执行慢语句后再用explain命令查看这些语句执行计划
mysql> show processlist;
+----+------+-----------+------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+------+-----------+------+---------+------+-------+------------------+
| 53 | root | localhost | NULL | Query | 0 | NULL | show processlist |
+----+------+-----------+------+---------+------+-------+------------------+
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