ORA-01594: attempt to wrap into rollback segment (string) extent (string) which is being freed

ORA-01594: attempt to wrap into rollback segment (string) extent (string) which is being freed

Cause: Undo generated to free a rollback segment extent is attempting to write into the same extent due to small extents and or or too many extents to free

Action: The rollback segment shrinking will be rollbacked by the system; increase the optimal size of the rollback segment.