MYSQL教程mysql正确安全清空在线慢查询日志slow log的流程分享

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《MysqL教程MysqL正确安全清空在线慢查询日志slow log的流程分享》要点：
本文介绍了MysqL教程MysqL正确安全清空在线慢查询日志slow log的流程分享，希望对您有用。如果有疑问，可以联系我们。

MysqL必读1,see the slow log status;

MysqL必读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)

MysqL必读2,stop the slow log server.

MysqL必读MysqL> set global slow_query_log=0;
query OK,0 rows affected (0.27 sec)

MysqL必读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必读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)

MysqL必读3,reset the new path of slow log

MysqL必读MysqL> set global slow_query_log_file='/MysqLlog/slow_log/slow_querIEs_3306_new.log';
query OK,0 rows affected (0.03 sec)

MysqL必读4,start the slow log server

MysqL必读MysqL>
MysqL>
MysqL> set global slow_query_log=1;
query OK,0 rows affected (0.01 sec)

MysqL必读
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)

MysqL必读5,check the slow sql in the new slow log file.

MysqL必读MysqL> select sleep(10) as a,1 as b;
+---+---+
| a | b |
+---+---+
| 0 | 1 |
+---+---+
1 row in set (10.00 sec)

MysqL必读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: 0
SET timestamp=1392273864;
select sleep(10) as a,1 as b;

MysqL必读6,backup the old big slow log file to other directory.

MysqL必读mv /MysqLlog/slow_log/slow_querIEs_3306.log /MysqLbackup/slow_log/slow_querIEs_3306.log.bak.20140213

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