MySQL正确安全清空在线慢查询日志slow log

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1、see the slow log status;

mysql> show variables like %slow%;

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

| Variable_name | Value |

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

| log_slow_queries | ON |

| slow_launch_time | 2 |

| slow_query_log | ON |

| slow_query_log_file | /mysqllog/slow_log/slow_queries_3306.log |

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

4 rows in set (0.00 sec)

2、stop the slow log server.

mysql> set global slow_query_log=0;

Query OK, 0 rows affected (0.27 sec)

mysql> show variables like %slow%;

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

| Variable_name | Value |

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

| log_slow_queries | OFF |

| slow_launch_time | 2 |

| slow_query_log | OFF |

| slow_query_log_file | /mysqllog/slow_log/slow_queries_3306.log |

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

4 rows in set (0.00 sec)

mysql> show variables like %slow%; -- check slow log status

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

| Variable_name | Value |

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

| log_slow_queries | OFF |

| slow_launch_time | 2 |

| slow_query_log | OFF |

| slow_query_log_file | /mysqllog/slow_log/slow_queries_3306.log |

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

4 rows in set (0.00 sec)

3、reset the new path of slow log

mysql> set global slow_query_log_file=/mysqllog/slow_log/slow_queries_3306_new.log;

Query OK, 0 rows affected (0.03 sec)

4、start the slow log server

mysql> set global slow_query_log=1;

Query OK, 0 rows affected (0.01 sec)

mysql> show variables like %slow%;

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

| Variable_name | Value |

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

| log_slow_queries | ON |

| slow_launch_time | 2 |

| slow_query_log | ON |

| slow_query_log_file | /mysqllog/slow_log/slow_queries_3306_new.log |

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

4 rows in set (0.00 sec)

5、check the slow sql in the new slow log file.

mysql> select sleep(10) as a, 1 as b;

+---+---+

| a | b |

+---+---+

| 0 | 1 |

+---+---+

1 row in set (10.00 sec)

mysql>exit;

[mysql@xxx-xxx ']$ more /mysqllog/slow_log/slow_queries_3306_new.log

......

Time Id Command Argument

# Time: 140213 6:44:24

# User@Host: root[root] @ localhost []

# Query_time: 10.000365 Lock_time: 0.000000 Rows_sent: 1 Rows_examined: 0

SET timestamp=1392273864;

select sleep(10) as a, 1 as b;

6、 backup the old big slow log file to other directory.

mv /mysqllog/slow_log/slow_queries_3306.log /mysqlbackup/slow_log/slow_queries_3306.log.bak.20140213

原文：http://www.zhujiangroad.com/program/MySQL/71912.html

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