What commands are mainly used to perform mysql data recovery?

MySQL data recovery commands mainly include: mysqldump: export database backup. mysql: Import SQL backup files. pt-table-checksum: Verify and repair table integrity. MyISAMchk: Repair MyISAM tables. InnoDB technology: Automatically recover committed transactions, or manually via the innobackupex tool.

MySQL data recovery commands

In the MySQL database, the following commands are mainly used for data recovery:

1. mysqldump

mysqldump is used to create a backup of the database or table. This command exports the database or table structure and its data to a SQL file. To recover the data, simply recreate the database or table using the SQL file and re-import the data.

Syntax:

<code>mysqldump [选项] 数据库名 > 备份文件.sql</code>

2. mysql

The mysql command is used to connect to the MySQL database and execute SQL statements. You can use this command to import the SQL backup file created earlier using mysqldump.

Syntax:

<code>mysql [选项] -u 用户名 -p 密码 数据库名 < 备份文件.sql</code>

3. pt-table-checksum

pt-table-checksum is a third-party tool used to verify database tables of integrity. If data from a table is corrupted or missing, this tool can help identify and fix the problem.

Syntax:

<code>pt-table-checksum --databases 数据库名 --tables 表名</code>

4. MyISAMchk

MyISAMchk is a built-in MySQL command used to repair MyISAM tables. This command can repair damaged table headers, indexes, or data blocks.

Syntax:

<code>myisamchk --repair 表名</code>

5. InnoDB technology

The InnoDB engine has automatic recovery function. When a database crashes, InnoDB automatically attempts to recover committed transactions. If recovery fails, you can perform recovery manually by following these steps:

• Stop the MySQL service.
• View the InnoDB log file to determine the location of the corruption.
• Use the innobackupex tool to create consistent backups from log files.
• Restart the MySQL service and import the backup.

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