Mysql slow query log (slow_query_log_file) Switch slow_query_log_file the log becomes very large and it is inconvenient to analyze its input items. We want to generate a slow_query_log_file file every day and analyze the log file every day. How to
MySQL slow query, MySQL
Brief description:
To analyze the query performance of MySQL statements, in addition to using the EXPLAIN command to output the execution plan, MySQL can also record the statements whose query exceeds the specified time, the
MySQL slow query log analysis bitsCN.com
The most basic is mysql's mysqlslowdump
Easy to use:
Mysqldumpslow-s c-t 20 host-slow.log
Parameters:
1.-s, sorting, c, t, l, r, and ac, at, al, and ar are sorted by query times, time, lock time, and
In a production environment, logstash often processes logs in multiple formats. Different log formats have different parsing methods. The following is an example of how logstash processes multi-line logs and analyzes MySQL slow query logs. This is a
Slow query logs are composed of some SQL statements. When the query time exceeds the value of long_query_time, the slow query log is generated. The minimum value of longquerytime is 1 s and the default value is 1 s.
Slow query logs are composed of
Mysql has a function to log down and run slow SQL statements. This log is not available by default. To enable this function, modify my. cnf or add some parameters when mysql is started.
If you modify it in my. cnf, add the following
MySQL slow query log
MySQL supports slow query logs. You can configure query records that have exceeded the specified time for SQL query to log. This is a very effective tool in optimizing SQL queries and can help us quickly locate the problematic
MySQL slow query: enabling slow query and mysql Query
1. What is the use of slow queries?
It records all SQL statements that have been executed longer than long_query_time, and helps you find slow SQL statements to optimize these SQL statements.
Ii.
MySQL slow Query
Slow query (slow log)It can help us locate specific SQL statements for SQL statement optimization. For example, slow query logs record the SQL statements whose execution time exceeds the given value, so as to locate the
1. How to enable slow query for MySQL in Windows:
The configuration file of MySQL in Windows is usually my. ini, and the path of my path is c: \ mysql \ My. ini. You can find
Compile my. ini and add it under [mysqld]
Log-Slow-queries= D: \ mysql \
MySQL version is mysql5.6.22, installation environment Windows7.1. Use this query log to find SQL statements of efficiency problems and record them for monitoring.You can query and set the slow query log using the following statement(1) Check if the
In web development, we often write some SQL statements, a bad SQL statement may make your entire program is very slow, more than 10 seconds, the average user will choose to close the page, how to optimize the SQL statements to run longer time SQL
1,Https://github.com/Meituan-Dianping/SQLAdvisor/blob/master/doc/QUICK_START.mdhttp://www.ttlsa.com/mysql/meituan-sql-optimization-tool-sqladvisor/Enter the command in the MySQL client:Show variables like '%quer% ';The options for the red box
First, Introduction to open the slow query log, you can let the MySQL record query over a specified time of the statement, through the location analysis performance bottlenecks, to better optimize the performance of the database systemSecond,
First, simple installationwget percona.com/get/pt-query-digestchmoe u+x pt-query-digestSecond, simple useMoreReference article: Http://blog.itpub.net/29773961/viewspace-2024992/pt-query-digest is a set of tools to help DBAs manage MySQL
Input command:show variables like ' slow% 'You can find that Slow_query_log is OFF (default), indicating that the slow query log is not turned onSlow_query_log_file for slow query log fileThere are two ways to turn on the slow query logMethod One:
First, IntroductionTurn on the slow query log, you can let the MySQL record query over a specified time of the statement, through the location analysis of performance bottlenecks, to better optimize the performance of the database system.Second,
To view the configuration:View slow query time show variables like "Long_query_time"; Default 10sView slow query configuration show status like "%slow_queries%";View slow query log path show variables like "%slow%";Modifying a configuration fileAdd
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.