How to effectively recover MySQL data after accidentally deleting it

Accidental deletion of important data in the database is every MySQL user's nightmare. Sometimes, when we delete some useless data, we do not review it carefully, and as a result, we delete the really important data together. At this point, what should we do?

Fortunately, MySQL provides rich recovery functions. In this article, we will introduce you some practical methods to help you effectively recover accidentally deleted data.

Method 1: Use backup files

For important data, we usually back it up just in case. In this case, recovering accidentally deleted data will become very simple. Just open the backup file, find the accidentally deleted data, and copy it to the MySQL database.

When using backup files for recovery, please be sure to pay attention to the following points:

1. Whether the backup file is available: Make sure the backup file is not damaged or lost.
2. The age of the backup file: If the backup file was created several months or a year ago, the recovered data may be out of date.
3. Backup scope: Ensure that the backup file contains accidentally deleted data.

Method 2: Use MySQL Binlog file

MySQL's Binlog is a log file used to record all operations in the database. By checking log files, accidentally deleted data can be found and restored.

The following are the steps for recovery using Binlog files:

1. Enter the command "SHOW BINARY LOGS;" in the MySQL command line to view all available Binlog files.
2. Find the statement where the deleted data is located in the log file, and record its log location information.
3. Open the MySQL command line and enter the command "STOP SLAVE;" to stop writing operations in the database.
4. Restore backup data to MySQL to ensure data integrity.
5. Enter the command "PURGE BINARY LOGS TO 'log_filename';", where log_filename is the name of the log file to be deleted. This will keep log file records until the location of the accidentally deleted data is found.
6. Enter the command "CHANGE MASTER TO MASTER_LOG_FILE='log_filename', MASTER_LOG_POS=position;", where log_filename is the Binlog file name used when data is accidentally deleted, and position is the log position record of the data.
7. Enter the command "START SLAVE;" to continue writing to the database.

Method 3: Use third-party tools

If you are not familiar with MySQL backup file and Binlog file operations, or you need to retrieve an older data version, you can use the third-party tool Third-party recovery tools.

Here are some popular tools available for MySQL data recovery:

1. MySQL Smoke Software (MyDumper): A tool for quickly backing up and restoring MySQL databases.
2. MySQL dump recovery tool: A tool that converts SQL dump files into MySQL database tables.
3. Oracle VM VirtualBox: A tool that can recover accidentally deleted data in the MySQL virtual machine.
4. EaseUS Data Recovery Wizard: A tool capable of recovering data from deleted partitions or drives.

Summary

We don’t have to panic when encountering accidental deletion of the database. There are many good ways to backup and restore beforehand. When using the above methods, please be sure to ensure the security and integrity of the data to avoid larger problems.

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