I am using the Oracle v.7. RDBMS. I am trying to delete some old data periodically by cascade-relationship. But the oracle tries to keep track of the changes and maintains a large roll-back segment. As the size of the data is so large, the ORACLE cann't manage its rollback segment and fails to delete the old data. Does any one know how to overcome this problem? Best Regards, satel@giconet.gsic.co.kr (100.4.7.1)