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查询t_system_user表所有数据
SELECT * FROM t_system_user;
找出执行上面SQL执行的ID
show profiles;
查看SQL执行每一步消耗的时间(下面表格内容是具体执行步骤)
show profile for query [ID]（show profile for query 33）
| status | Duration |
|---|---|
| starting | 2.1E-5 |
| checking permissions | 4E-6 |
| checking permissions | 3E-6 |
| Opening tables | 0.000199 |
| init | 5E-6 |
| System lock | 4E-6 |
| optimizing | 2E-6 |
| statistics | 9E-6 |
| preparing | 6E-6 |
| executing | 7E-6 |
| Opening tables | 7E-6 |
| checking permissions | 2.6E-5 |
| checking permissions | 7E-6 |
| checking permissions | 5E-6 |
| checking permissions | 5E-6 |
| checking permissions | 6E-6 |
| checking permissions | 5E-6 |
| checking permissions | 5E-6 |
| checking permissions | 9E-6 |
| Sending data | 4.4E-5 |
| end | 3E-6 |
| query end | 4E-6 |
| closing tables | 2E-6 |
| removing tmp table | 3E-5 |
| closing tables | 3E-6 |
| freeing items | 4.8E-5 |
| cleaning up | 1.4E-5 |