mysql> show variables like "%long%"; //查看一下默認為慢查詢的時間10秒

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

| Variable_name | Value |

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

| long_query_time | 10.000000 |

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

1 row in set (0.00 sec)

mysql> set global long_query_time=2; //設置成2秒，加上global,下次進mysql已然生效

Query OK, 0 rows affected (0.00 sec)

mysql> show variables like "%slow%"; //查看一下慢查詢是不是已經開啟

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

| Variable_name | Value |

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

| log_slow_queries | OFF |

| slow_launch_time | 2 |

| slow_query_log | OFF |

| slow_query_log_file | /var/lib/mysql/mysql-slow.log |

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

4 rows in set (0.00 sec)

mysql> set slow_query_log='ON'; //加上global，不然會報錯的。

ERROR 1229 (HY000): Variable 'slow_query_log' is a GLOBAL variable and should be set with SET GLOBAL

mysql> set global slow_query_log='ON'; //啟用慢查詢

Query OK, 0 rows affected (0.28 sec)

mysql> show variables like "%slow%"; //查看是否已經開啟

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

| Variable_name | Value |

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

| log_slow_queries | ON |

| slow_launch_time | 2 |

| slow_query_log | ON |

| slow_query_log_file | /var/lib/mysql/mysql-slow.log |

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

4 rows in set (0.00 sec)

總結

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