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What are the basic methods of using MySQL?

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May 26, 2023 pm 05:09 PM

mysql

MySQL is the most popular relational database management system. In terms of WEB applications, MySQL is one of the best RDBMS (Relational Database Management System) application software.

MySQL installation

Download the MySQL installation file

The following two files are required to install MySQL. All can be downloaded from the official website.

MySQL installation

The installation commands for the server and client are as follows:

[root@test1 local]# rpm -ivh MySQL-server-5.2.0-0.glibc23.i386.rpm[root@test1 local]# rpm -ivh MySQL-client-5.2.0-0.glibc23.i386.rpm

On the server side, to test whether the installation is successful, you can run netstat to check whether the MySQL port is open. The default port is 3306 , the command is as follows:

[root@test1 local]# netstat -nat

Start and stop MySQL

Start

After the MySQL installation is completed, the startup file mysql is in the /etc/init.d directory Next, when you need to start, run the following command:

[root@test1 init.d]# /etc/init.d/mysql start

Stop and restart

Note: The commands may be different due to different versions. Only this version is listed here. For other versions of the command, please ask Du Niang.

[root@test1 local]# service mysqld stop[root@test1 local]# service mysqld restart

MySQL configuration

Several important directories

After MySQL is installed, unlike SQL server, which is installed in a directory by default, its database files , configuration files and command files are in different directories. Here are several directories: 1. Database directory

/etc/lib/mysql/

2. Configuration file

/usr/share/mysql(mysql.server命令及配置文件)

3. Related commands

/usr/bin(mysqladmin、mysqldump等命令)

4. Startup script

/etc/rc.d/init.d/

Change login password

MySQL does not have a password by default. The importance of adding a password after installation is self-evident. 1. Command

usr/bin/mysqladmin -u root password \&#39;new-password&#39;\

Format: mysqladmin -u username -p old password password new password 2. Example (add password to root 123456):

[root@test1 local]# usr/bin/mysqladmin -u root password 123456

Note: because root does not have a password at the beginning , so -p old password can be omitted.

Database Backup and Recovery

1. Backup the database

mysqldump &ndash;user=root &ndash;password=root密码 &ndash;lock-all-tables 数据库名 > 备份文件.sql

2.Restore the database

mysql -u root &ndash;password=root密码 数据库名

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