怎么使用MySQL profile
发布时间：2021-12-17 10:06:17 所属栏目：MySql教程 来源：互联网
导读：本篇内容主要讲解怎么使用MySQL profile，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习怎么使用MySQL profile吧! 剖析单条查询 profile: mysql show variables like %prof%; +------------------------+------
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本篇内容主要讲解“怎么使用MySQL profile”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么使用MySQL profile”吧! 剖析单条查询 profile: mysql> show variables like '%prof%'; +------------------------+-------+ | Variable_name | Value | +------------------------+-------+ | have_profiling | YES | | profiling | OFF | | profiling_history_size | 15 | +------------------------+-------+ 3 rows in set (0.00 sec) mysql> set profiling = 1; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> show variables like '%prof%'; +------------------------+-------+ | Variable_name | Value | +------------------------+-------+ | have_profiling | YES | | profiling | ON | | profiling_history_size | 15 | +------------------------+-------+ 3 rows in set (0.00 sec) mysql> use mysql; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> select count(*) from user; +----------+ | count(*) | +----------+ | 4 | +----------+ 1 row in set (0.03 sec) mysql> show profiles; +----------+------------+------------------------------+ | Query_ID | Duration | Query | +----------+------------+------------------------------+ | 1 | 0.00103425 | show variables like '%prof%' | | 2 | 0.00016325 | SELECT DATABASE() | | 3 | 0.00049450 | show databases | | 4 | 0.00039775 | show tables | | 5 | 0.02702100 | select count(*) from user | +----------+------------+------------------------------+ 5 rows in set, 1 warning (0.00 sec) mysql> show profile for query 5; +----------------------+----------+ | Status | Duration | +----------------------+----------+ | starting | 0.000090 | | checking permissions | 0.000012 | | Opening tables | 0.000030 | | init | 0.000035 | | System lock | 0.000016 | | optimizing | 0.025417 | | executing | 0.000054 | | end | 0.000551 | | query end | 0.000020 | | closing tables | 0.000021 | | freeing items | 0.000732 | | cleaning up | 0.000045 | +----------------------+----------+ 12 rows in set, 1 warning (0.00 sec) 到此，相信大家对“怎么使用MySQL profile”有了更深的了解，不妨来实际操作一番吧！这里是亿速云网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！ （编辑：娄底站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
