| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> 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: Riyaj_Shamsudeen_at_i2.com
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 <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).Received on Tue Aug 14 2001 - 11:15:59 CDT
<br><font size=2 face="sans-serif">Hermanto</font>
<br><font size=2 face="sans-serif"> 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.</font>
<br><font size=2 face="sans-serif"> 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.</font>
<br>
<br><font size=2 face="sans-serif">Thanks<br>
Riyaj "Re-yas" Shamsudeen<br> Certified Oracle DBA<br> i2 technologies www.i2.com</font>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td>
<td><font size=1 face="sans-serif"><b>Hermanto P
<hermanto_p_at_aprilasia.com></b></font>
<br><font size=1 face="sans-serif">Sent by: root_at_fatcity.com</font>
<p><font size=1 face="sans-serif">08/14/01 03:35 AM</font>
<br><font size=1 face="sans-serif">Please respond to ORACLE-L</font>
<br>
<td><font size=1 face="Arial"> </font>
<br><font size=1 face="sans-serif"> To:
Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com></font>
<br><font size=1 face="sans-serif"> cc:
</font>
<br><font size=1 face="sans-serif"> Subject:
How can I get my DB back if I lost one of my rollback segment (rb</font></table>
<br>
<br>
<br><font size=2 face="Courier New">Hi gurus,<br>
Recently, I have forgotten to backup one of rollback segment file<br> (rbs02.dbf).<br> When I want to restore..the db can not startup normally.<br> Anyone can give me advise..<br> Thanks in advance.<br>
<br>
Warm regards,<br> Hermanto<br> -- <br> Please see the official ORACLE-L FAQ: http://www.orafaq.com<br> -- <br> Author: Hermanto P<br> INET: hermanto_p_at_aprilasia.com<br>
<br>
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051<br> San Diego, California -- Public Internet access / Mailing Lists<br> --------------------------------------------------------------------<br> To REMOVE yourself from this mailing list, send an E-Mail message<br> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in<br> the message BODY, include a line containing: UNSUB ORACLE-L<br> (or the name of mailing list you want to be removed from). You may<br> also send the HELP command for other information (like subscribing).<br>
</font>
<br>
<br>
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: INET: dgoulet_at_vicr.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).
 |
 |