Table of Contents
What is the difference between MyISAM and InnoDB of mysql? How to optimize MYSQL database? , myisaminnodb
Home Backend Development PHP Tutorial What is the difference between mySQL's MyISAM and InnoDB? How to optimize MYSQL database? , myisaminnodb_PHP tutorial

What is the difference between mySQL's MyISAM and InnoDB? How to optimize MYSQL database? , myisaminnodb_PHP tutorial

Jul 13, 2016 am 09:46 AM
mysql database

What is the difference between MyISAM and InnoDB of mysql? How to optimize MYSQL database? , myisaminnodb

The basic difference between MyISAM and InnoDB

1.InnoDB does not support FULLTEXT type indexes.

2. InnoDB does not save the specific number of rows in the table. That is to say, when executing select count(*) from table, InnoDB has to scan the entire table to calculate how many rows there are, but MyISAM only needs to simply read Just print out the number of saved rows. Note that when the count(*) statement contains a where condition, the operations of the two tables are the same.

3. For fields of type AUTO_INCREMENT, InnoDB must contain an index with only this field, but in the MyISAM table, a joint index can be established with other fields.

4. When DELETE FROM table, InnoDB will not re-create the table, but will delete it row by row. MyISAM is a table, innodb is a row lock

5. LOAD TABLE FROM MASTER (from the main load table) operation does not work for InnoDB. The solution is to first change the InnoDB table to a MyISAM table, import the data and then change it to an InnoDB table, but for This does not apply to tables that use additional InnoDB features (such as foreign keys).

In addition, the row lock of the InnoDB table is not absolute. If MySQL cannot determine the range to be scanned when executing a SQL statement, the InnoDB table will also lock the entire table, for example, update table set num=1 where name like “"2%”

6.InnoDB supports things

Select storage engine according to actual situation.

Generally, it is recommended to use myIsam if there are many queries.

If you need transaction processing or foreign keys, then InnoDB may be a better way.

Methods to optimize MYSQL database:

1. Select the most applicable field attribute, reduce the length of the defined field as much as possible, and try to set the field to NOT NULL, such as 'province, gender', it is best to set it to ENUM

2, use join instead of subquery

3. Use UNION to replace manually created temporary tables

4. Transaction processing (to ensure data integrity, such as adding and modifying at the same time, if both are true, both will be executed, and if one fails, it will fail)

5. Build an index appropriately (how to build an index? What are the pros and cons of indexing?)

6, optimize sql statement

7, explain can see the mysql execution plan

8, sub-table (vertical sub-table, horizontal sub-table?)

Related reading

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

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

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1033982.htmlTechArticleWhat is the difference between MyISAM and InnoDB of mysql? How to optimize MYSQL database? , myisaminnodb The basic differences between MyISAM and InnoDB 1.InnoDB does not support FULLTEXT type indexes. 2.InnoDB is not guaranteed...
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 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 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 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