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