optimize table

MySQL storage engine (Table type) selection, mysql Engine Unlike most databases, MySQL has a storage engine concept. You can select different storage engines based on data storage requirements. This blog introduces the storage engine in MySQL. MySQL

Parse the cause of fragmentation in the mysql table and clear it. A large amount of data deletion will inevitably lead to discontinuous blank spaces in the data file. when inserting data, these blank spaces will be used. If a storage engine breaks

How do you feel if you are a racing driver and you can immediately change the engine without driving your car to the garage? What MySQL database does for developers is like changing the engine by pressing a button. it lets you select a database

This article mainly introduces the SESSION class implemented by php, including session creation, initialization, and reading? How many seconds does it mean? It is a very practical technique. if you need it, you can refer to the example in this

This section provides some guidance on how to select data types to help improve the query speed: Do not use long data columns when you can use short data columns. If you have a CHAR data column with a fixed length, do not let it exceed the actual

The process of server shutdown can be summarized as follows: 1. start and close the process 2. the server creates a thread as needed. 3. the server stops receiving new connections. 4. the server terminates the current activity. the storage engine is

Websites with a slightly larger size usually have several servers. each server runs modules with different functions and uses different second-level domain names. The User System of a website with a strong integrity is unified, that is, a user name

This shows the encoding specification from the PHPCMS development documentation. although it is called the PHPCMS development specification, I think this applies to all PHP programming. After writing so many PHP codes, many codes may not be able to

Mysql Performance Optimization 1. optimize table 2. analyze table 3. try to declare the column as NOT NULL 4. Mysql only uses the prefix index to avoid creating an index on an existing index prefix.For example, do not create an index (a) on index

Mysqlslowlog control reference official documentation: dev.mysql.comdocrefman5.6enslow-query-log.html ??? Can MySQL record that the execution time exceeds the parameter? Long_query_time? The SQL statement that sets the value is not recorded by

How to query slow SQL statements in MySQL 1. query logs (1) enabling MySQL slow query in Windows In Windows, the configuration file of MySQL is usually my. ini. find [mysqld] and add The code is as follows: Log-slow-queries =

Shift speed for MySQL database (1) If you are a racing driver and you can immediately change the engine by clicking the button without driving the car to the garage, what would it feel like? What MySQL database does for developers is like changing

Phpmysqlpdo operation class provides mysql addition, deletion, modification, query, and other operations [Code] [PHP] code Class pdomysql {public static $ dbtype = 'mysql'; public static $ dbhost = ''; public static $ dbport =''; public static $

Considerations for MySQL big data operations Http://netkiller.github.io/journal/mysql.parallel.htmlMr. Neo Chen (netkiller), Chen Jingfeng (BG7NYT) Xishan Meidi, Minzhi Street, Longhua New District, Shenzhen city, Guangdong province, China518131+ 86

Understanding MySQL-index and optimization is at the beginning: indexes have a crucial impact on the query speed. understanding indexes is also the starting point for database performance tuning. Consider the following: assume that a table in the

The table is designed in this way! IMG (img.ask.csdn.netupload201507151436949175_57730.png) 2, 4, 5. Please ignore the fields that you want to query in this format. Level 1 category, level 2 category, Level 3 category, Level 3 category, level 2

First knowledge of the database-start from MySQL to learn Web development, but also to understand the database first. Databases are categorized and varied. currently I have selected MySQL. After reading MySQL, I felt that it was not very difficult

This article mainly introduces Mysql log files and log types. This article describes the log file types, error logs, General query logs, slow query logs, binary logs, and so on, for more information, see Log file type MySQL has several different

1. mysql-log-filter tool script usage instructions: an analysis tool found on googlecode provides two executable scripts: python and php. Code. google. compmysql-log-filter (requires a ladder to climb the wall), bitsCN Download link: 1.

MySQL4.0 update to mysql5.0 method bitsCN.com 1. major changes from 4.0 to 4.1 If an InnoDB table containing the TIMESTAMP field is created in MySQL from version 4.1.0 to version 4.1.3. You need to recreate the table when upgrading to 4.1.4 and