首页 热点资讯 义务教育 高等教育 出国留学 考研考公
您的当前位置:首页正文

Findoutslowsqlofmysql_MySQL

2020-11-09 来源:化拓教育网

bitsCN.com

Find out slow sql of mysql

Recent days, I should do a sql tuning for a mysql database, and I know a bit of mysql db. In order to find the slow sql, i do the slow_query_log on to collect the slow sql.

[sql]mysql> show variables like 'slow%'; +---------------------+-------------------------------------------+ | Variable_name | Value | +---------------------+-------------------------------------------+ | slow_launch_time | 2 | | slow_query_log | ON | | slow_query_log_file | /opt/mysql_data/mysql/mysql-test-slow.log | +---------------------+-------------------------------------------+ 3 rows in set (0.00 sec) mysql> set global slow_launch_time=5; Query OK, 0 rows affected (0.00 sec) mysql> show variables like 'slow%'; +---------------------+-------------------------------------------+ | Variable_name | Value | +---------------------+-------------------------------------------+ | slow_launch_time | 5 | | slow_query_log | ON | | slow_query_log_file | /opt/mysql_data/mysql/mysql-test-slow.log | +---------------------+-------------------------------------------+ 3 rows in set (0.00 sec) We can read /opt/mysql_data/mysql/mysql-test-slow.log to find slow sql.


bitsCN.com
显示全文