[MySQLSlowlog]正确安全清空在线慢查询日志slowlog的流程

[MySQLSlowlog]正确安全清空在线慢查询日志slowlog的流程_MySQL

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发布： 2016-05-27 14:12:20

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[mysqlslowlog]正确安全清空在线慢查询日志slowlog的流程_mysql

1, see the slow log status;

mysql> show variables like &#39;%slow%&#39;;
+---------------------+------------------------------------------+
| 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)

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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 &#39;%slow%&#39;;
+---------------------+------------------------------------------+
| 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 &#39;%slow%&#39;; -- 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)

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3, reset the new path of slow log

mysql> set global slow_query_log_file=&#39;/mysqllog/slow_log/slow_queries_3306_new.log&#39;;
Query OK, 0 rows affected (0.03 sec)

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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 &#39;%slow%&#39;;
+---------------------+----------------------------------------------+
| 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)

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

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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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以上就是[MySQLSlowlog]正确安全清空在线慢查询日志slowlog的流程_MySQL的内容，更多相关内容请关注PHP中文网（www.php.cn）！

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[MySQLSlowlog]正确安全清空在线慢查询日志slowlog的流程_MySQL