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This article will explain in detail how to safely empty the online slow query log slow log in mysql. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

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: 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

This is the end of the article on "how to correctly and safely empty the online slow query log slow log in mysql". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it out for more people to see.

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