mysql query designer

***************************Id: 2Select_type: DEPENDENT SUBQUERYTable: IType: refPossible_keys: subcategoryKey: subcategoryKey_len: 4Ref: c. idRows: 28Extra: Using indexIf you are not familiar with how to analyze mysql statement query plans, see: mysql plans to execute queries from the outside to the inside, rather than from the inside to the outside. I will intr

About buffered queries and no buffer queriesThere are two types of queries for MySQL clients:buffered queries: will receive the results of the query and store them in the client's cache, and the request to obtain row records is only obtained locally.(1) Advantage: You can move the "current row" pointer freely in the result set, which is easy to find because the result is in the presence of the client.(2) Di

Tags: share track picture ack purge backup LED option integrationObjectiveThe log of the database is a strong basis for helping the database administrator to track the various events that have occurred in the database before. MySQL provides error log, Binlog log (binary log), investigate log, slow query log. Here, I seek to solve the following question: What is the purpose of each log? How to control these

In linux, mysql enables slow queries. mysql statements that affect the query speed are slow, it may be that the write is not reasonable or the multi-table joint query in big data, etc. Therefore, we need to find these statements, analyze the causes, and optimize them. 1. Method 1: enable slow

PHPMYSQL implements login and fuzzy query, and mysql fuzzy query. PHPMYSQL implements login and fuzzy query functions. mysql fuzzy query uses the following software versions: PHP version 5.5.12 and

Tags: query log slow file ace log mysql open-res queryFirst, 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

When you submit a query, MySQL will analyze it to see if some optimization can be done to make it faster to process the query. This section describes how the query optimizer works. If you want to know the optimization methods used by MySQL, you can refer to the

Reference article:Http://ourmysql.com/archives/1359?utm_source=tuicoolutm_medium=referralOfficial: Https://github.com/box/AnemometerSingle-node anemometer monitoring1 Installing Anemometer# cd/data/www/web3# git clone https://github.com/box/Anemometer.gitanemometer CD anemometer2 Creating tables and user names# mysql-uroot-proot We can look at the following table structure as follows650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M01/82/C2/wKi

Recently played MySQL, found a very good tool, can be the MySQL slow query can be seen, convenient for us to find and analyze the slow inquiry statement, the steps are not many, but on-line detailed tutorials less, not enough detailed, accidentally, estimated that the egg pain a while, hahaPercona Toolkit is an advanced set of command-line tools for managing

at the beginning, the-p old password can be omitted.2, then change the root password to djg345. Mysqladmin-u root-p ab12 Password djg3453, adding new usersNote: Unlike above, the following is because it is a command in the MySQL environment, so it is followed by a semicolon as the command TerminatorFormat: Grant Select on database. * To User name @ login host identified by "password"1, add a user test1 password for ABC, so that he can log on any host

Label: Original address: Use Anemometer to visualize MySQL slow query based on Pt-query-digest 84223932 This article mainly introduces the use of anemometer based on pt-query-digest MySQL slow query visualization, because the onli