mysql slow

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MySQL Slow query

As we all know, in the case of large traffic, can add node or change the schema can effectively alleviate the database pressure, but all the origin, all from a single MySQL start. The following summarizes some of the experiences that have been used

Mysql slow query and slow query log analysis

As we all know, in the case of large traffic, can add node or change the schema can effectively alleviate the database pressure, but all the origin, all from a single MySQL start. The following summarizes some of the experiences that have been used

MySQL slow SQL and index case

Written in the firstAbout the start and configuration of slow SQL before I clean up the article:Http://www.cnblogs.com/hanxiaobei/p/5515624.htmlPrerequisite Preparation:tomcat7.xMysql--perfteachJmeterTest interface:

MySQL Slow query-delete slow query log

First, the environmentOs:centos Release 5.8 (64-bit)db:mysql5.5.17Second, the operation Delete the slow query log directly from the command rm-fThird, problems ariseSlow query log is not automatically generated, (if there is a backup, copy back

MySQL Slow query

sometimes we're less efficient in locating systems. Query syntax, you need to open the slow query log, which is slowquery Log . The command to open the slow query log is as follows:ViewMysql> showvariables like '%slow% ';+---------------------+------

MySQL slow query and Optimization Test

Edit the my. cnf or my. ini file and remove the comments of the following lines of code:Copy codeThe Code is as follows:Log_slow_queries =/var/log/mysql/mysql-slow.log.Long_query_time = 2Log-queries-not-using-indexes This will record slow queries

In-depth explanation of mysql slow query settings

In web development, we often write some SQL statements. A bad SQL statement may make your entire program very slow. After 10 seconds, users usually choose to close the webpage, how to optimize SQL statements to find out SQL statements that have been

MySQL slow query log analysis

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 returned records respectively. Adding a is

Online MySQL slow query optimization Example 2 (1)-reprint

Slow Query Optimization of MySQL is a common topic. This article describes the actual problems encountered in the production database and provides examples. Enable slow query supportFirst, activate the slow query log, modify the my. CNF

MySQL slow query and slow query log analysis

Enable the slow query record function. Next, let's analyze the content of the slow query:   Select count (distinct. name) from cp_paycard as a left join cp_reservation as B on. uid = B. UID where. type = 2 and B. cpparkid = '000000' and B.

MySQL slow query log

As the data volume continues to grow, performance is particularly important. Perhaps after optimization and good solutions, you cannot feel the existence of performance problems, but as the data volume continues to grow, From millions to tens of

Enabling MySQL slow query log on Windows Host

Discuz is slow. when MySQL is frequently rushed to MySQL 100%, find the cause. Here, we will first write down the slow query log of MySQL on a Windows host, as shown below:Run the CMD command line in the bin directory of MySQL. net stop mysql. Find

In-depth explanation of mysql slow query settings

In web development, we often write some SQL statements. A bad SQL statement may make your entire program very slow. After 10 seconds, users usually choose to close the webpage, how to optimize SQL statements to find out SQL statements that have been

Comparison and Analysis of five common mysql slow log analysis tools

Enable slow log There are two activation methods: 1. In my. cnf, log-slow-queries [= file_name]2. When the mysqld process is started, specify the five common tools to be compared using the -- log-slow-queries [= file_name] Option. Mysqldumpslow,

Mysql slow log analysis tool pt-query-digest_MySQL

In windows, mysql5620 used mysqldumpslowpl to analyze slow logs. Today, we see a tool pt-query-digest, which was originally intended to be installed and used on windows. The result is to run C on windows: before ProgramFilesMySQLMySQLServer56b,

MYSQL slow droptable _ MySQL

As we all know, MYSQL's slow droptable operations know, Ext3 is not the most effective file system. for example, deleting files is very slow (it is really a painful process, isn't it ?), Resulting in a large number of random I/O. However, sometimes

Five common MySQL slow log analysis tools comparative analysis _php Tutorial

Enable slow LogThere are two ways to enable: 1, in MY.CNF through Log-slow-queries[=file_name] 2, when mysqld process starts, specify the--log-slow-queries[=file_name] option Five common tools for comparisonMysqldumpslow, Mysqlsla, Myprofi,

Use Python to send MySQL slow log emails

Because development performs Stability Construction for a system, it is necessary to audit the slow logs of the database system and check and optimize the system. Communicate with developers and select the recipient who regularly sends slow queries

Python analyzes MySQL slow logs and regularly sends emails

Because development performs stability construction for a system, it is necessary to audit the slow logs of the database system and check and optimize the system. Communicate with developers by regularly sending slow queries to the developed email

MySQL Slow SQL optimization

Factors that affect slow SQL queries1, no index or invalid index caused by the full table scan.2. The amount of data and the number of tables associated with the table.Index is invalid1. When a table is associated with a query, the field type or

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