Table of Contents
mysql的MyISAM 和 InnoDB 的区别?优化MYSQL数据库的方法?,myisaminnodb
Home php教程 php手册 mysql的MyISAM 和 InnoDB 的区别?优化MYSQL数据库的方法?,myisaminnodb

mysql的MyISAM 和 InnoDB 的区别?优化MYSQL数据库的方法?,myisaminnodb

Jun 13, 2016 am 08:57 AM
mysql database

mysql的MyISAM 和 InnoDB 的区别?优化MYSQL数据库的方法?,myisaminnodb

MyISAM 和 InnoDB 的基本区别

1.InnoDB不支持FULLTEXT类型的索引。

2.InnoDB 中不保存表的具体行数,也就是说,执行select count(*) from table时,InnoDB要扫描一遍整个表来计算有多少行,但是MyISAM只要简单的读出保存好的行数即可。注意的是,当count(*)语句包含 where条件时,两种表的操作是一样的。

3.对于AUTO_INCREMENT类型的字段,InnoDB中必须包含只有该字段的索引,但是在MyISAM表中,可以和其他字段一起建立联合索引。

4.DELETE FROM table时,InnoDB不会重新建立表,而是一行一行的删除。MyISAM 是表所 innodb是行锁

5.LOAD TABLE FROM MASTER(从主负载表)操作对InnoDB是不起作用的,解决方法是首先把InnoDB表改成MyISAM表,导入数据后再改成InnoDB表,但是对于使用的额外的InnoDB特性(例如外键)的表不适用。

另外,InnoDB表的行锁也不是绝对的,如果在执行一个SQL语句时MySQL不能确定要扫描的范围,InnoDB表同样会锁全表,例如update table set num=1 where name like “"2%”

6.InnoDB 支持事物

选择存储引擎 根据实际情况选择。

一般情况下如果查询多建议使用myIsam 。

如果你需要事务处理或是外键,那么InnoDB 可能是比较好的方式。

 

优化MYSQL数据库的方法:

 

1,选取最适用的字段属性,尽可能减少定义字段长度,尽量把字段设置NOT NULL,例如'省份,性别',最好设置为ENUM

 

2,使用join代替子查询

 

3,使用联合(UNION)来代替手动创建的临时表

 

4,事务处理(保证数据完整性,例如添加和修改同时,两者成立则都执行,一者失败都失败)

 

5,适当建立索引(如何建立索引?索引的利与弊?)

 

6,优化sql语句

 

7,explain可以看到mysql执行计划

 

8,分表(垂直分表,水平分表?)

相关阅读

http://www.phpernote.com/mysql/500.html

http://www.nowamagic.net/librarys/veda/detail/1899

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP development practice: Use PHPMailer to send emails to users in the MySQL database PHP development practice: Use PHPMailer to send emails to users in the MySQL database Aug 05, 2023 pm 06:21 PM

PHP development practice: Use PHPMailer to send emails to users in the MySQL database Introduction: In the construction of the modern Internet, email is an important communication tool. Whether it is user registration, password reset, or order confirmation in e-commerce, sending emails is an essential function. This article will introduce how to use PHPMailer to send emails and save the email information to the user information table in the MySQL database. 1. Install the PHPMailer library PHPMailer is

Go language and MySQL database: How to separate hot and cold data? Go language and MySQL database: How to separate hot and cold data? Jun 18, 2023 am 08:26 AM

As the amount of data continues to increase, database performance has become an increasingly important issue. Hot and cold data separation processing is an effective solution that can separate hot data and cold data, thereby improving system performance and efficiency. This article will introduce how to use Go language and MySQL database to separate hot and cold data. 1. What is hot and cold data separation processing? Hot and cold data separation processing is a way of classifying hot data and cold data. Hot data refers to data with high access frequency and high performance requirements. Cold data

To what extent can I develop MySQL database skills to be successfully employed? To what extent can I develop MySQL database skills to be successfully employed? Sep 12, 2023 pm 06:42 PM

To what extent can I develop MySQL database skills to be successfully employed? With the rapid development of the information age, database management systems have become an indispensable and important component in all walks of life. As a commonly used relational database management system, MySQL has a wide range of application fields and employment opportunities. So, to what extent do MySQL database skills need to be developed to be successfully employed? First of all, mastering the basic principles and basic knowledge of MySQL is the most basic requirement. MySQL is an open source relational database management

How to perform incremental data backup of MySQL database using Go language How to perform incremental data backup of MySQL database using Go language Jun 17, 2023 pm 02:28 PM

As the amount of data increases, database backup becomes more and more important. For the MySQL database, we can use the Go language to achieve automated incremental backup. This article will briefly introduce how to use Go language to perform incremental backup of MySQL database data. 1. Install the Go language environment. First, we need to install the Go language environment locally. You can go to the official website to download the corresponding installation package and install it. 2. Install the corresponding library. The Go language provides many third-party libraries for accessing MySQL databases, among which the most commonly used ones are

How to use MySQL database for time series analysis? How to use MySQL database for time series analysis? Jul 12, 2023 am 08:39 AM

How to use MySQL database for time series analysis? Time series data refers to a collection of data arranged in time order, which has temporal continuity and correlation. Time series analysis is an important data analysis method that can be used to predict future trends, discover cyclical changes, detect outliers, etc. In this article, we will introduce how to use a MySQL database for time series analysis, along with code examples. Create a data table First, we need to create a data table to store time series data. Suppose we want to analyze the number

How to use MySQL database for image processing? How to use MySQL database for image processing? Jul 14, 2023 pm 12:21 PM

How to use MySQL database for image processing? MySQL is a powerful relational database management system. In addition to storing and managing data, it can also be used for image processing. This article will introduce how to use a MySQL database for image processing and provide some code examples. Before you begin, make sure you have installed a MySQL database and are familiar with basic SQL statements. Create a database table First, create a new database table to store the image data. The structure of the table can be as follows

How to make reliable MySQL database connection using Go language? How to make reliable MySQL database connection using Go language? Jun 17, 2023 pm 07:18 PM

With the large amount of data that needs to be stored and processed, MySQL has become one of the most commonly used relational databases in application development. The Go language is becoming more and more popular among developers due to its efficient concurrency processing and concise syntax. This article will lead readers to implement reliable MySQL database connection through Go language, allowing developers to query and store data more efficiently. 1. Several ways for Go language to connect to MySQL database. There are usually three ways to connect to MySQL database in Go language, which are: 1. Third-party library

MySQL database and Go language: How to perform data caching? MySQL database and Go language: How to perform data caching? Jun 17, 2023 am 10:05 AM

In recent years, the Go language has become increasingly popular among developers and has become one of the preferred languages ​​for developing high-performance web applications. MySQL is also a popular database that is widely used. In the process of combining these two technologies, caching is a very important part. The following will introduce how to use Go language to handle the cache of MySQL database. The concept of caching In web applications, caching is a middle layer created to speed up data access. It is mainly used to store frequently requested data to

See all articles