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During a ROLLBACK, the database system undoes all changes that a transaction executed in the database. To do this, the database system uses the transaction's undo log entries.

The database system then releases all locks that have been allocated to the transaction, implicitly deletes all results tables that have been generated by the transaction, and opens a new transaction.

Note Note

Any changes that are have been completed by a COMMIT can no longer be reversed by a ROLLBACK.

End of the note.

ROLLBACK can be explicitly requested using the ROLLBACK statement.

More Information

SQL Reference Manual, ROLLBACK Statement

Concepts of the Database System, How Databases Log Data Changes