mysql正确安全清空在线慢查询日志slow log的流程分享

2023年 4月 23日 48.6k 0

1, see the slow log status; mysql show variables like '%slow%'; +---------------------+------------------------------------------+ | Variable_name | Value | +---------------------+------------------------------------------+ | log_slow_queri

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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