Oracle : Ошибка ORA-01594

"attempt to wrap into rollback segment (%s) extent (%s) 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 too
many extents to free
*Action: The rollback segment shrinking will be rollbacked by the system;
increase the optimal size of the rollback segment.

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