How to restore data for a single table in MySQL binlog?
The steps to recover data for a single table using binlog in MySQL are as follows:
- Firstly, confirm the database and table name where the table to be restored is located.
- You can find the binlog file name and position corresponding to the table to be recovered. You can use the following command to view the binlog file name and position where the table was last updated:
- Display the current status of the master.
- Take note of the values for File and Position.
- To parse the binlog file and find the operation statements related to a specific table, you can use the mysqlbinlog command. For example, to find the operations related to the table mydb.mytable, execute the following command in the command line:
- Create a restore.sql file by extracting data from the mysql-bin.xxxxxx binary log starting at position xxx and stopping at position yyy.
- xxx and yyy are the values of Position recorded in step 2, mysql-bin.xxxxxx is the value of File recorded in step 2, and restore.sql is the filename for saving the recovery statements.
- Open the restore.sql file to view the statements that operate on the corresponding tables. As needed, you can delete or modify some statements.
- Create a new table in MySQL to store recovered data. You can use the following command to create a new table:
- Create a table called mytable_restore in the database mydb that has the same structure as the table mytable.
- This will create a new table with the same structure as the original table.
- Execute the operations statements in the restore.sql file to restore the data into a new table. You can use the following command to execute the restore.sql file:
- Restore the “mydb” database using the “restore.sql” file with the username prompt.
- In this case, username refers to the MySQL username, mydb is the name of the database, and restore.sql is the name of the file to be executed.
- After the recovery is completed, you can export the data from the new table in the desired format and import it into the original table, or simply use the new table as the recovered data.
Please note that the binlog file may contain statements for other tables. Therefore, before recovering data, carefully examine and verify the recovery statements to ensure that only the desired table’s data is restored. Additionally, there may be constraints and dependencies that need to be manually addressed during data recovery.