How to data rollback?

Data rollback is a process in which a database or system is reverted to a previous state, effectively undoing changes that occurred after a specific point in time. It is a way to recover data or system integrity in the event of errors, data corruption, or other undesirable changes that may have occurred in the database.

Rollback functionality is commonly found in database management systems (DBMS) and is often used to maintain data consistency and recover from unexpected situations, such as:

1. Transaction failures: If a transaction (a series of database operations) encounters an error or is incomplete, a rollback ensures that the database is returned to its state before the transaction started, avoiding the persistence of partial or incorrect data.

2. Data corruption: In cases where data has become corrupted due to hardware failures, software bugs, or other issues, a data rollback can help restore the database to a known, clean state.

3. Unintended changes: Sometimes, due to human error or application bugs, incorrect data may be inserted, updated, or deleted in a database. A rollback can undo these changes and restore the data to its previous state.

4. Disaster recovery: In the event of a catastrophic failure or data loss, organizations may use backups to restore the system to a previous point in time, effectively rolling back the data to a known state.

It's important to note that data rollback is only possible if there are appropriate backups or data snapshots taken at various points in time. Regularly backing up data and maintaining backups at different intervals can facilitate data rollback and ensure data recoverability in critical situations.