| ERROR | attempt to use rollback segment (string) new extent (string) which is being allocated |
| CAUSE | 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. |
| ACTION | 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. |