一、show profiles
查看profiles功能是否打开
mysql> show variables like ‘profiling‘;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| profiling | OFF |
+---------------+-------+
1 row in set (0.03 sec)
在当前会话中打开profiles
mysql> show variables like ‘profiling‘;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| profiling | OFF |
+---------------+-------+
1 row in set (0.03 sec)
查询当前会话有哪些sql
show profiles查询指定sql的详细时间耗费
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)