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Undo Log Management 
The undo log entries for transactions are written and managed in undo log management. The database system uses the undo log entries to reinstate a database with a consistent transaction status that corresponds to the status that existed at the time of the most recent savepoint.
A user task always writes undo log entries when it carries out modifying SQL statements. It stores the undo log entries in its undo log file.

See also:
Using Log Entries at Restart or Recovery
