Label: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 slow
When the -- log-slow-queries [= file_name] option is enabled, mysqld writes a log file containing all SQL statements whose execution time exceeds long_query_time seconds. Obtaining the initial lock time is not counted as the execution time.
If the file_name value is not given, no host name is provided by default, and the suffix is-slow. log. If the file name is p
meaning of top n, that is, the number of data records in the previous row-g, followed by a RegEx matching pattern, case insensitiveMysqldumpslow-s c-t 20 host-slow.logMysqldumpslow-s r-t 20 host-slow.logThe preceding command shows the 20 most frequently accessed SQL statements and the 20 most returned SQL statements in the record set.Mysqldumpslow-t 10-s t-g "left join" host-slow.log returns the first 10 SQL statements containing the left join according to time.Mysql slow
A basic tutorial on MySQL slow query log analysis,
0. First, check whether slow query is Enabled:
(1) quick way to run SQL statements
show VARIABLES like "%slow%"
(2) go to my. conf to view the information.
Configuration in my. conf (add it below [mysqld)
[Mysqld] log-slow-
Tags: database install mysql Windows restart command slow queryToday in testing 4 million records of MySQL slow query, database installed on Windows, Baidu a lot, there is no test feasible solution or experience, probably because the MySQL version is different! Make a record here to forget the time can be viewed, but a
The function of the query log is to record all the SQL statements sent by the client, that is, to record all operations of the client
Log parameter is going to be obsolete, now replace with General_log
Open Query Log Feature
Mysql
or not viewix. viewing MySQL database version informationCommand Line InputMysql-vMySQL Ver 14.14 distrib 5.1.73, for Redhat-linux-gnu (x86_64) using ReadLine 5.1The database version has not changed, or the 5.1 versiongo to the database to view MySQL version/usr/local/mysql/bin/mysql-uroot-p PasswordMysql> select vers
Original address: http://itlab.idcquan.com/linux/MYSQL/922126.htmlThe MySQL slow query log is very useful for tracking problematic queries, which can be used to analyze the SQL statements that consume resources in the code implementation, and have a high reference to the optimization of our program. This article is mai
The MySQL slow query log provides query information over a specified time threshold, providing a major reference for performance optimization, and is a very useful feature.MySQL Slow query log is very simple to open and configure,
Label: how to query the MySQL log Category: MySQL2012-02-23 19:14 26756 People read Comments (2) favorite reports MysqlcommandprintingserversocketoutputToday, the American boss sent an email, a word of what happen to ...? Any other clues do not, I give the answer, each to find out whether the cause of the problem or recover data, update the problem? A procedu
Tags: Japanese view status open run MySQL test globTo view the configuration: View slow query time
show variables like "Long_query_time"; Default 10s View slow query configuration
show status like "%slow_queries%"; View slow query log path
show variables like "%slow%"; Mod
In the front of the blog "when, how to open the MySql log?" ", we learned how to enable the slow query log for MYSQL. Today we look at how to read these slow query logs.Before you trace a slow
MySQL Slow query log is a log record provided by MySQL, which is used to record the corresponding time in MySQL over the threshold of the statement, that is, the running time exceeds the long_query_time value of SQL, will be recor
In front of the blog "when, how to open the MySql log?" ", we learned how to enable the slow query log for MYSQL. Today we look at how to read these slow query logs. Before tracing the slow q
Tags: write generated bsp MySQL col alt units should be two kinds ofInput command:show variables like ' slow% ' You can find that Slow_query_log is OFF (default), indicating that the slow query log is not turned on Slow_query_log_file for slow query log file There are two
1 Slow query definitionmeans that MySQL logs all SQL statements that execute a time threshold that exceeds the Long_query_time parameter setting. The slow query log is the log that logs these SQL.2 Turn on slow query logLocate the
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 lines:
Long_query_time = 10
Log-slow-queri
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