mysql查看sql执行时间

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懂视网 时间：2022-04-30 11:56

执行要分析的SQL语句

mysql> select count(1) from wechat_employee,Employee;

显示profiles表

mysql> show profiles;

查询结果：

+----------+------------+-----------------------------------------------+
| Query_ID | Duration | Query      |
+----------+------------+-----------------------------------------------+
| 1 | 0.00072975 | select count(1) from wechat_employee,Employee |
| 2 | 0.00028450 | set profiling=1    |
| 3 | 0.00324875 | select count(1) from wechat_employee,Employee |
+----------+------------+-----------------------------------------------+

查询详细信息：

show profile cpu,block io for query 3;

结果：

+--------------------------------+----------+----------+------------+--------------+---------------+
| Status    | Duration | CPU_user | CPU_system | Block_ops_in | Block_ops_out |
+--------------------------------+----------+----------+------------+--------------+---------------+
| starting   | 0.000041 | 0.000000 | 0.000000 |  0 |  0 |
| Waiting for query cache lock | 0.000073 | 0.000000 | 0.000000 |  0 |  0 |
| checking query cache for query | 0.000025 | 0.000000 | 0.000000 |  0 |  0 |
| checking privileges on cached | 0.000023 | 0.000000 | 0.000000 |  0 |  0 |
| checking permissions  | 0.000018 | 0.000000 | 0.000000 |  0 |  0 |
| checking permissions  | 0.000012 | 0.000000 | 0.000000 |  0 |  0 |
| sending cached result to clien | 0.003009 | 0.000000 | 0.004000 |  0 |  0 |
| logging slow query  | 0.000032 | 0.000000 | 0.000000 |  0 |  0 |
| cleaning up   | 0.000018 | 0.000000 | 0.000000 |  0 |  0 |
+--------------------------------+----------+----------+------------+--------------+---------------+
9 rows in set (0.00 sec)

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使用Profiles分析SQL语句执行时间和消耗资源

标签：mysql   profiling   

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