ORA-01562 failed to extend rollback segment ID = num
Cause: A failure occurred while trying to extend the rollback segment. The problem is usually lack of space in the database to extend the rollback segment.
Action: This is usually followed by another message stating the cause of the failure. Shut down and take appropriate action for the error that caused the failure. If no other messages follow this message, the cause is probably lack of space in the database.