How to recover accidentally deleted data in MySQL

In daily work, MySQL database is a very commonly used database, but it is not perfect. Sometimes, accidentally deleting data is unavoidable, and then you need to recover the accidentally deleted data. This article will introduce some recovery methods for MySQL accidentally deleted data.

1. Back up data

Before performing any operation, you should back up the MySQL database. In this way, even if the data is accidentally deleted, it can be restored from the backup file. In order to ensure the integrity of the backup data, you can use the mysqldump command to export the database:

mysqldump -u root -p database > database_backup.sql

where root is the MySQL user name, database is the name of the database to be backed up, and the > operator writes the exported results into into a file named database_backup.sql.

2. Use Binlog file

Binlog file is the binary log that MySQL records all operations. If there is no backup file available, you can recover accidentally deleted data through the binary log. The method is as follows:

(1) View the Binlog file

Use the following command to view the Binlog file name:

show binary logs;

You can see the list of Binlog files and their names in the current MySQL.

(2) Locate the time of accidental deletion of data

Find the corresponding Binlog file and its offset based on the time of accidental deletion of data. You can use the following command:

mysqlbinlog --start-datetime="YYYY-MM-DD HH:MM:SS" --stop-datetime="YYYY-MM-DD HH:MM:SS" /path/to/binlog/file

where start-datetime and stop-datetime represent the start time and end time respectively. You can use datetime or position to locate accidentally deleted data points.

(3) Restore data

After finding the Binlog file and offset of accidentally deleted data, you can use the following command to restore the data:

mysqlbinlog /path/to/binlog/file --start-position=offset --stop-position=offset | mysql -h serverAddress -u userName -p

Among them, /path/to /binlog/file is the Binlog file path, offset is the offset, serverAddress is the server address, userName is the MySQL user name, and the -p option indicates that a password is required.

3. Use third-party tools

If the above methods cannot recover accidentally deleted data, you can consider using some third-party tools. For example:

MySQL Binlog Viewer: You can view the contents of the Binlog file.

Recovery for MySQL: Data can be recovered from backup files.

Navicat for MySQL: Can provide the function of backing up and restoring data.

In short, accidentally deleting data is an embarrassing situation, but it is not desperate. As long as the backup is timely and the method is appropriate, accidentally deleted data can be restored without affecting the business.

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