1；在控制台操作，查看是否已开启profileshow variables like "%pro%";

+---------------------------+-------+

| Variable_name | Value |

+---------------------------+-------+

| have_profiling | YES |

| profiling | OFF |未开启

| profiling_history_size | 15 |

| protocol_version | 10 |

| proxy_user | |

| slave_compressed_protocol | OFF |

| stored_program_cache | 256 |

+---------------------------+-------+

2；开启profileset profiling=1;

show variables like "%pro%";

+---------------------------+-------+

| Variable_name | Value |

+---------------------------+-------+

| have_profiling | YES |

| profiling | ON |

| profiling_history_size | 15 |

| protocol_version | 10 |

| proxy_user | |

| slave_compressed_protocol | OFF |

| stored_program_cache | 256 |

+---------------------------+-------+

3；进行测试(以毫秒为单位)select * from user;

show profiles;

+----------+------------+-----------------------------+

| Query_ID | Duration| Query |

+----------+------------+-----------------------------+

| 1 | 0.00152800 | show variables like "%pro%" |

| 2 | 0.00098075 | show tables |

| 3 | 0.00035975 | select * from user |

| 4 | 0.00077625 | select * from user |

| 5 | 0.00090725 | show variables like "%pro%" |

| 6 | 0.00068650 | select * from user |

| 7 | 0.00069100 | select * from user |

| 8 | 0.00088225 | select * from user |

+----------+------------+-----------------------------+

4；查看指定语句的详细执行(Query_ID)show profile for query 8;

+----------------------+----------+

| Status | Duration |

+----------------------+----------+

| starting | 0.000084 |

| checking permissions | 0.000016 |

| Opening tables | 0.000038 |

| init | 0.000068 |

| System lock | 0.000020 |

| optimizing | 0.000011 |

| statistics | 0.000032 |

| preparing | 0.000019 |

| executing | 0.000005 |

| Sending data | 0.000347 |

| end | 0.000014 |

| query end | 0.000008 |

| closing tables | 0.000054 |

| freeing items | 0.000141 |

| cleaning up | 0.000027 |

+----------------------+----------+