How Can I Restore a MySQL Database Using .myd, .myi, and .frm Files?

Restoring a MySQL Database from .myd, .myi, and .frm Files

Database recovery can become necessary in various scenarios. If you have encountered data loss or corruption and possess the original .myd, .myi, and .frm files, it is possible to restore a MySQL database from these files.

Procedure

For MyISAM tables, follow these steps to restore the database:

1. Place the Files: Copy the .frm, .myd, and .myi files into a valid database directory (e.g., /var/lib/mysql/dbname). The database and server configurations do not need to match the original settings.
2. Change Ownership (Optional): If required, adjust file ownership to the appropriate user (e.g., chown -R mysql:mysql /var/lib/mysql/dbname).
3. Repair Table: Execute the REPAIR TABLE command to rebuild the .MYI index file.

Considerations

• Permissions (e.g., GRANT) are stored in the mysql database, so you may need to manually recreate them after restoration.
• Downgrading MySQL versions is possible, but refer to the release notes and consider running the mysql_upgrade utility for compatibility.
• This method only applies to MyISAM tables and is not applicable to InnoDB tables.
• Mixing and matching tables from different sources may compromise data integrity between tables.

By following these steps, you can successfully restore a MySQL database from .myd, .myi, and .frm files.

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