max mysql query

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170727. mysql Query performance optimization

MySQL Query performance optimizationThe optimization of MySQL query performance involves many aspects, including library table structure, establishing reasonable index and reasonable query. The library table structure includes how to design

MySQL slow query (ii)-Pt-query-digest detailed slow query log pt-query-digest slow log analysis

Essays-66 Articles-0 comments-MySQL slow query (ii)-Pt-query-digest detailed slow query log one, Introduction Pt-query-digest is a tool for analyzing MySQL slow query, it can analyze Binlog, Gene RAL Log, Slowlog, can also be analyzed via

Example of MySQL cluster configuration under CentOS

Installation RequirementsInstallation Environment: CentOS-6.3Installation Method: source code compilation installationSoftware Name: mysql-cluster-gpl-7.2.6-linux2.6-x86_64.tar.gzDownload Address: http://mysql.mirror.kangaroot.net/Downloads/Software

Query statements with two max conditions in SQL

The previous period of time to find a job to take part in the written test, the written question has a SQL query statement, the condition is that two fields are the maximum, the first instinct is two fields (for example, age, hight) equals Max (),

MySQL Query performance optimization

This article is "high-performance MySQL" Reading notes Slow Query Basics: Optimizing data accessThe most basic reason for poor query performance is that there is too much data to access. For inefficient queries, we found that the following two

MySQL slow query (ii)-Pt-query-digest detailed slow query log

First, IntroductionPt-query-digest is a tool for analyzing slow queries for MySQL, which analyzes Binlog, general log, Slowlog, It can also be analyzed using showprocesslist or MySQL protocol data crawled by tcpdump. The analysis results can be

Installing MySQL in Linux and solutions to some common problems _ MySQL-mysql tutorial

1. download MySql 1. download MySql Open http://www.mysql.com/downloads/mysql/#downloads download in browser My downloaded version is Red Hat 5 version of http://www.mysql.com/downloads/mirror.php? Id = 407552 Upload the file to the server, or

SQL query records for MAX () Max () in a category field in a table

The problem is: the database has a table code with a click Field Click_num and a category field kind and other information fields. now to find out the most hits in each category of the record, if it is 10 categories, then the result should be 10

MySql basic query, connection query, subquery, and regular expression query _ MySQL-mysql tutorial

This article introduces four database query methods by combining text and text: Basic query, connection query, subquery, and regular expression query, for more information, see query data to obtain the required data from the database. Data query is

MySQL Slow query----pt-query-digest detailed slow query log (Linux system)

First, IntroductionPt-query-digest is a tool for analyzing slow queries for MySQL, which analyzes Binlog, general log, Slowlog, It can also be analyzed using showprocesslist or MySQL protocol data crawled by tcpdump. The analysis results can be

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