Thansk for your reply .. Crislor & Mark . That helps . You have understood the situation perfectly ... Mark . This customer uses oracle more than a decade and knows what ORA-600 is . We are new to their support team (and they have a bunch of other vendors supporting them) and hence they are just pulling our legs . Whatever I want to give them a clear crisp reply . And both of your reply really helped . Thanks a lot . Regards, JP