Oracle Error Message
ORA-01581: attempt to use rollback segment (string) new extent (string) which is being allocated
Reason for the Error
Undo generated to extend a rollback segment run out of current undo block space and is attempting to write into the new extent which has not been completely allocated.
Solution
The rollback segment extending will be rollbacked by the system, no more extension will be possible untill the next extent is freed up by rolling back or committing other transactions.