RE: Re[2]: How can I get my DB back if I lost one of my rollback

Koivu, Lisa Tue, 14 Aug 2001 10:20:50 -0700

Title: RE: Re[2]: How can I get my DB back if I lost one of my rollback

Hi Dick,

I see your point. What about when the db does something similar to a shutdown abort? Then you do need your rollback segments to perform a full recovery.

-----Original Message-----
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Sent:   Tuesday, August 14, 2001 12:26 PM
To:     Multiple recipients of list ORACLE-L
Subject:        Re[2]: How can I get my DB back if I lost one of my rollback

Riyaj,

Rollback segments are needed for recovery? I think your confused with the
online redo logs. When a DB shuts down the rollback segments are emptied out
either because the transactions have been rolled back or committed. Once you
start the recovery process the rollback segments are no longer required as the
data therein is in the on-line redo logs.

Dick Goulet

____________________Reply Separator____________________
Author: [EMAIL PROTECTED]
Date: 8/14/2001 6:41 AM

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 <[EMAIL PROTECTED]>
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08/14/01 03:35 AM
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To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
 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
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Author: Hermanto P
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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
 
 
 
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<td>Hermanto P
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08/14/01 03:35 AM
 Please respond to ORACLE-L
 
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     How can I get my DB back if I lost one of my rollback
segment (rb</table>
 
 
 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 
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Please see the official ORACLE-L FAQ: http://www.orafaq.com 
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Author: Hermanto P 
 INET: [EMAIL PROTECTED] 
 
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538-5051 
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RE: Re[2]: How can I get my DB back if I lost one of my rollback

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