What is the method to recover mistakenly deleted data in DB2?

There are several ways to recover mistakenly deleted data in a DB2 database.

1. The UNDO command in DB2 database can be used to restore accidentally deleted data. It reverts the database back to the state before the deletion, and reinserts the deleted data back into the database.
2. The DB2 database also supports the FLASHBACK command, which can be used to restore accidentally deleted data. This command will restore the database to a specific point in time and reinsert any data that was mistakenly deleted after that time.
3. Restore from Backup: If there is a backup of the database, you can recover mistakenly deleted data by restoring from the backup. Begin by locating the most recent backup, then restore the backup data to the database, and finally insert the mistakenly deleted data back into the database.
4. Recovery using log files: DB2 database records all transaction logs, which can be used to restore mistakenly deleted data. Firstly, locate the transaction log containing the mistakenly deleted data, then apply the log file to the database, and finally insert the mistakenly deleted data back into the database.

It is important to note that before performing data recovery operations, it is necessary to stop the database from running to prevent further modifications that could lead to recovery failure. Additionally, data recovery operations may affect the performance of the database, so it is necessary to evaluate the impact before proceeding and choose the appropriate recovery method.