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mysql日志记录(1)慢查询
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mysql日志记录(1)慢查询
祈雨的博客
2017-11-05
1、默认值
MySQL默认关闭慢查询：
mysql> show variables like 'slow_query_log';
MySQL默认查询时间大于10秒的SQL语句为慢查询:
mysql> show variables like 'long_query_time';
2、打开慢查询
启动慢查询日志：
mysql> set global slow_query_log=on;
修改慢查询的时间阀值为3秒：
mysql> set global long_query_time=3;
注 long_query_time字段的值必须退出MySQL重新登录才会刷新数据。
mysql> select sleep(4);
慢查询日志默认为mysql/datadir/localhost-slow.log
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