Re: How can I get my DB back if I lost one of my rollback segment (rb

Hermanto
        Rollback segment data files are *needed* for recovery. Rollback segments are the key component for consistent media/instance recovery. If you lose any of the rollback segment files and if any extents from that datafile are needed then the database can not do the recovery consistently and will give you errors. Is it the only data file associated with the rollback segment tablespace. If that is the case, there will be extents from the rollback segments. If there are no extents from the rollback segments then you could potentially offline drop the datafile, do the media recovery and do open resetlogs. What errors are you getting ? Stuck recovery ? Errors will tell you whether the recovery process is looking for rollback segments or the data file.
        Please contact Oracle support if there are any rollback extents in this datafile. _offline_rollback_segments and _corrupted_rollback_segments parameters can be used to hard open the database. But DO expect data consistency errors. In fact, only thing you should do is open this way, extract the data out and import in to a new database. Contact Oracle Support before you do this since there are serious consequences of doing this.

Thanks
Riyaj "Re-yas" Shamsudeen
Certified Oracle DBA
i2 technologies   www.i2.com

Hermanto P <hermanto_p_at_aprilasia.com>
Sent by: root_at_fatcity.com
08/14/01 03:35 AM
Please respond to ORACLE-L

       
        To:        Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc:        
        Subject:        How can I get my DB back if I lost one of my rollback segment (rb

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: hermanto_p_at_aprilasia.com

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: ListGuru_at_fatcity.com (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).