MySQL正确安全清空在线慢查询日志slow log的流程分享

这篇文章主要为大家详细介绍了MySQL正确安全清空在线慢查询日志slow log的流程分享，具有一定的参考价值，可以用来参考一下。

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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>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>mysql>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>[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: 0SET 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

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