MYSQL 使用show profiles 分析性能

Show profiles是5.0.37之后添加的，要想使用此功能，要确保版本在5.0.37之后。如果要使用此功能，先查看mysql版本是否高于5.0.37

查看数据库版本：

mysql> select version(); +-----------+ | version() | +-----------+ | 5.7.9-log | +-----------+ 1 row in set (0.00 sec) 说明此版本mysql具有此功能。

打开分析工具：

set @@prifileing=1; 执行查询：

mysql> select uid from u_user_master where id_card like '%233%'; +-----+ | uid | +-----+ | 48 | | 62 | | 67 | | 68 | | 69 | | 140 | | 145 | | 146 | | 166 | +-----+ 9 rows in set (0.00 sec) 查看mysql性能

mysql> show profiles; +----------+------------+------------------------------------------------------------+ | Query_ID | Duration | Query | +----------+------------+------------------------------------------------------------+ | 1 | 0.00033300 | select uid from u_user_master where id_card like '%233%' | | 2 | 0.00005900 | show version() | | 3 | 0.00013300 | select version() | | 4 | 0.00041800 | select uid from u_user_master where id_card like '%233%' | +----------+------------+------------------------------------------------------------+ 4 rows in set, 1 warning (0.00 sec) 第二列表示查询所用的时间。

根据Query_ID 查看某个查询的详细时间耗费

mysql> show profile for query 4; +----------------------+----------+ | Status | Duration | +----------------------+----------+ | starting | 0.000071 | | checking permissions | 0.000007 | | Opening tables | 0.000016 | | init | 0.000023 | | System lock | 0.000020 | | optimizing | 0.000010 | | statistics | 0.000016 | | preparing | 0.000012 | | executing | 0.000003 | | Sending data | 0.000148 | | end | 0.000005 | | query end | 0.000006 | | closing tables | 0.000008 | | freeing items | 0.000020 | | logging slow query | 0.000041 | | cleaning up | 0.000012 | +----------------------+----------+ 16 rows in set, 1 warning (0.00 sec) 查看cpu、IO等信息

mysql> show profile block io, cpu for query 4; +----------------------+----------+----------+------------+--------------+---------------+ | Status | Duration | CPU_user | CPU_system | Block_ops_in | Block_ops_out | +----------------------+----------+----------+------------+--------------+---------------+ | starting | 0.000071 | 0.000065 | 0.000005 | 0 | 0 | | checking permissions | 0.000007 | 0.000005 | 0.000002 | 0 | 0 | | Opening tables | 0.000016 | 0.000016 | 0.000001 | 0 | 0 | | init | 0.000023 | 0.000021 | 0.000001 | 0 | 0 | | System lock | 0.000020 | 0.000009 | 0.000011 | 0 | 0 | | optimizing | 0.000010 | 0.000009 | 0.000002 | 0 | 0 | | statistics | 0.000016 | 0.000015 | 0.000001 | 0 | 0 | | preparing | 0.000012 | 0.000011 | 0.000001 | 0 | 0 | | executing | 0.000003 | 0.000001 | 0.000001 | 0 | 0 | | Sending data | 0.000148 | 0.000148 | 0.000001 | 0 | 0 | | end | 0.000005 | 0.000002 | 0.000002 | 0 | 0 | | query end | 0.000006 | 0.000006 | 0.000001 | 0 | 0 | | closing tables | 0.000008 | 0.000007 | 0.000001 | 0 | 0 | | freeing items | 0.000020 | 0.000008 | 0.000012 | 0 | 0 | | logging slow query | 0.000041 | 0.000022 | 0.000019 | 0 | 0 | | cleaning up | 0.000012 | 0.000011 | 0.000001 | 0 | 0 | +----------------------+----------+----------+------------+--------------+---------------+ 16 rows in set, 1 warning (0.00 sec)

作者：KevinWorld 链接：https://www.jianshu.com/p/7afcd5ba3708 來源：简书 著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。