MySQL慢日志(mysql_slow 近期收到某服务器磁盘告警,登录查看后发现是 mysql_slow.log文件过大导致告警。为了释放磁盘空间,需要对该文件进行清理。 mysql-slow.log文件是记录sql语句的执行时间超过设置的long_query_time的语句,默认1秒钟,可以根据数据库实例进行调整设置1...
slow_query_log_file=/var/lib/mysql/my-slow.log #慢查询日志的目录和文件名信息 long_query_time=3 #设置慢查询的阈值为3秒,超出此设定值的SQL即被记录到慢查询日志 log_output=FILE # 一般有两种形式,一种是输出到文件FILE中,一种是写入数据表格table中,会保存到mysql库的slow_log表中 1. 2. 3. 4...
[mysqld]slow_query_log=1slow_query_log_file= /xxx/mysql-slow.loglong_query_time=1# 也可以写成这种形式slow-query-log=1slow-query-log-file= /xxx/mysql-slow.loglong-query-time=1 重启mysql服务。 关闭日志 临时关闭,重启失效: mysql>setglobalslow_query_log=OFF; 永久关闭,修改my.cnf,重启mysql...
设置查询日志的输出位置,可以在mysql服务启动时通过--log-output参数指定,也可以在服务运行时设置,如下所示 D:\MySQL\MySQL Server 5.5\bin> mysqld --log-output=Table,File --general_log --log-output参数值有三个选项,Table,File,None --Table,即将日志记录到日志表中,相对应的有general_log和slow_log表...
一、背景 一般情况下,线上环境的MySQL实例都会开启slow log来收集MySQL的慢日志,用来分析业务应用中的慢SQL,达到优化SQL的目的。 收集慢SQL,有几个参数...
配置mysql slow Mysql 5.5 log-slow-queries = F:/MySQL/log/mysqlslowquery.log long_query_time = 2 Mysql 5.6 show variables like '%slow_query%'; slow-query-log=1/on slow-query-log-file=mysql-slow.log showglobalvariables like'%long_query%';long_query_time=2showglobalvariables like'%indexe...
Slow Mysql optimizer Posted by:Jeganathan Thangavel Date: February 03, 2010 04:02AM The sub queries are spending most of the time in preparing stage. We have the following query pattern with sub queries and like search. SELECT DISTINCT(a.post_id), a.post_date as post_dt, a.cat_id, ...
I've setup mysql slow query log on my database server and set the long query time to 5. Just checked the log and its logging queries that take only milliseconds. Anyone know why that would be?, here's some of the log. The last query isn't exactly the most optimised. It says it ...
Mysql slow log提供了一种方式对数据库中慢查询进行记录并且对日志进行输出,以便于我们定位服务器性能问题。我们可能会简单的把它理解为记录所有执行时间超过long_query_time的查询,其实这仅仅是其中一个条件。下面我们从源码角度分析一下slow log的写入机制。
Slow query Posted by:Manu Swami Date: April 21, 2015 11:15AM Hello, We have recently migrated an application to a newer server. In old server MySql version was 5.0. and in new server MySql version is 5.6. I have observed a performance issue after migration. In a particular event, my ...