Rollback (data management)

In database technologies, a rollback is an operation which returns the database to some previous state. Rollbacks are important for database integrity, because they mean that the database can be restored to a clean copy even after erroneous operations are performed. They are crucial for recovering from database server crashes; by rolling back any transaction which was active at the time of the crash, the database is restored to a consistent state.

For other uses, see Rollback (disambiguation).

The rollback feature is usually implemented with a transaction log, but can also be implemented via multiversion concurrency control.

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