[MySQLSlowlog]正确安全清空在线慢查询日志slowlog的流程_MySQL
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2022-05-07 11:45:56
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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 '%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
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