一、show profiles
查看profiles功能是否打開

mysql> show variables like 'profiling'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | profiling | OFF | +---------------+-------+ 1 row in set (0.03 sec)

在當前會話中打開profiles

mysql> show variables like 'profiling'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | profiling | OFF | +---------------+-------+ 1 row in set (0.03 sec)

查詢當前會話有哪些sql

show profiles

查詢指定sql的詳細時間耗費

mysql> show profile for query 3; +----------------------+----------+ | Status | Duration | +----------------------+----------+ | starting | 0.000087 | | checking permissions | 0.000017 | | Opening tables | 0.000023 | | init | 0.000045 | | System lock | 0.000018 | | optimizing | 0.000021 | | statistics | 0.000075 | | preparing | 0.000028 | | Sorting result | 0.000016 | | executing | 0.000015 | | Sending data | 0.000023 | | Creating sort index | 0.026676 | | end | 0.000026 | | query end | 0.000018 | | closing tables | 0.000020 | | freeing items | 0.000024 | | logging slow query | 0.000038 | | cleaning up | 0.000021 | +----------------------+----------+ 18 rows in set, 1 warning (0.04 sec)

轉載于:https://www.cnblogs.com/yuanlairlj/p/8543355.html

總結

以上是生活随笔為你收集整理的mysql 性能剖析-profiles的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。