optimize table

Reference article: http://www.jb51.net/article/24392.htmWhen we design the database table structure, we need to pay attention to the performance of the data operation when we operate the database, especially the SQL statements when we look at the

Operating environment: PHP 5.5.30-x64,mysql 5.6.27Error code: Cannot execute queries while other unbuffered queries is active.  Consider using Pdostatement::fetchall (). Alternatively, if your code is a ever going to run against MySQL, you may

1. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. You should try to avoid null values in the WHERE clause, otherwise it will cause

?Directoryfirst, the Common Database optimization method: ???? 1second, improve efficiency, anti-three paradigms: ???? 1First Paradigm: ???? 1Second paradigm: ???? 1The third paradigm: ???? 1inverse three-paradigm design: ???? 2third, positioning

The four storage engines commonly used in MySQL are: MyISAM storage engine, InnoDB storage engine, memory storage engine, archive storage engine. This article focuses on these four storage engines, and finally compares the four storage

I. Periodic checklists and Analysis tablesThe syntax for the parse table is as follows:ANALYZE [LOCAL | No_write_to_binlog] TABLE tbl_name [, Tbl_name] ...This statement is used to analyze and store the keyword distribution of the table, and the

Description: The environment for this article is CentOS 5.5 bit/mysql 5.1.50Introduction: The use of MySQL for some time, during the period did a lot of MySQL optimization, design, maintenance work, the two days have time to do a simple summary, to

Original link: HTTP://WWW.PROMPTNESS.CN/ARTICLE/41. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. You should try to avoid null

The storage engine in the database is actually a set of tables that use the engine, and the table in the database sets what storage engine, so the table has different "effects" in terms of how the data is stored, how the data is updated, the

1. How to log in to MySQL database Mysql-u username-p 2. How to turn on/off MySQL service Service MySQL Start/stop 3. Check the status of MySQL Service MySQL Status 4, how to display the number of all databases Show

http://blog.csdn.net/alongken2005/article/details/6394016Analyze TableMySQL Optimizer (optimized element) when optimizing SQL statements, you first need to gather some relevant information, including the table's cardinality (which can be translated

1. Make your data as small as possibleOne of the most basic optimizations is to make your data (and indexes) on the disk (and in Memory) occupy as little space as possible. This can give a huge improvement, because the disk reads quickly and usually

MySQL index, Clustered index is not a separate index type, but a data storage method. When a table has a clustered index, its data rows are actually stored in the index's leaf page. The term "clustering" indicates that data rows and adjacent health

Translator: ye Jinrong (Email :), source: imysql.cn 1. preface recently, we have optimized the discuz Forum (dz for short) as needed. Of course, it only involves database optimization. let's talk about the data volume of the server and dz, 2 * Intel

MySQL database performance optimization is the main core of this article, from database optimization design to specific operations. Good optimization can greatly improve the server performance. I hope this article will help you. 1. MySQL performance

The following article describes how to correctly master the characteristics of Dynamic tables in MySQL databases. It can be said that dynamic tables are frequently used in MySQL databases, therefore, it is also important to master the dynamic tables

Learning points:1. Web Database Overview2. MySQL operations3. MySQL common functions4. SQL statement details5. phpMyadmin   1. Web Database Overview Now, we are familiar with the basic knowledge of PHP. This is the chapter about leaving PHP for the

I. Summary of the causes of MyISAM Table Corruption in MySQL: 1. The data file is damaged due to a sudden power failure on the server. The mysql service is forcibly shut down without being shut down first. The mysqld process is killed when writing a

Abstract: This article introduces the optimization techniques for data tables. The main content is: select the table type and open as few tables as possible, the relationship between the locking table and the query speed and how to optimize the

MySqlibdata1 file is too large how to narrow down MySqlinnodb if it is a shared tablespace, ibdata1 file is getting bigger and bigger, reaching more than 30 GB, some useless tables are cleared: truncatetablexxx; then optimizetablexxx; no effect