Hermanto, That depends on whether your using public or private rollback segments. Personally I prefer private just for this reason. So, assuming your using private rollback segments: 1) shutdown your DB. 2) comment our the ROLLBACK_SEGS parameter in INIT.ora 3) startup mount the DB 4) alter database datafile 'rbs02.dbf' offline drop; 5) alter database open; 6) drop tablespace rbs including contents; 7) create tablespace rbs datafile 'rbs01.dbf' size <>; 8) create rollback segment <>; 9) repeat step 8 as often as desired. 10) shutdown db 11) uncomment ROLLBACK_SEGS parameter in init.ora, edit the values as required. 12) restart DB 13) coffee time. DickG. ____________________Reply Separator____________________ Author: Hermanto P <[EMAIL PROTECTED]> Date: 8/14/2001 12:35 AM Hi gurus, Recently, I have forgotten to backup one of rollback segment file (rbs02.dbf). When I want to restore..the db can not startup normally. Anyone can give me advise.. Thanks in advance. Warm regards, Hermanto -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Hermanto P INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).