Gabriel, Keep the system rbs. It is usually small (assuming it is not the only one) and is considered a system object (not something I would mess around with). I don't know that there is internal code that requires the system rbs/undo segment, but I also don't know that all the internal code does not reference it. In all the hacking I've done with undo, the idea of dropping the system undo segment never crossed my mind. Regards, Daniel Fink ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------