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Re: Database Crash...advice needed...

From: <djordan_at_notes.primeco.com>
Date: Wed, 30 Aug 2000 14:41:27 -0500
Message-Id: <10604.115914@fatcity.com>


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I had this message today after moving a database to another server, and was caused by bringing up a database with a missing rollback segment. After removing the entry (segment had been dropped but entry not removed on old server) from the config.ora/init.ora file, just shutting down and restarting brought the database right back up normal (SUN Solaris 7.3.4).

Also, if you have restored the RBS datafile from hotbackup and performed recovery, you might just have a corrupted rollback segment and can get away with just including the bad segment(s) in:

_corrupted_rollback_segments=(r01,r02,r03......r99)

My two cents,
David

prashasta gujrati <gujrati_at_tubes.tatasteel.com> on 08/30/2000 03:03:46 PM

Please respond to ORACLE-L_at_fatcity.com

                                                              
                                                              
                                                              
 To:      Multiple recipients of list ORACLE-L                
          <ORACLE-L_at_fatcity.com>                              
                                                              
 cc:      (bcc: David Jordan/HQ/PCS PrimeCo)                  
                                                              
                                                              
                                                              
 Subject: Database Crash...advice needed...                   
                                                              






Hi DBAs,

This is the scenario : Oracle 7.3.3 on AIX 4.3.2

Time Event

0300          Offline backup of the database done successfully.
1523          Hard disk failure on one of the disks(hdisk9) mounted
                 on /database. This FS had  1 system DBF, 2 RBS files,
                 3 application DBFs.

                 These files were taken offline automatically as
reported
                 in alert.log .

1530          Error reported of applications not working and DB having
                 crashed.

1535          Database was shutdown with abort and tried doing a
                 normal startup which failed. Database could only be
                 mounted. It has been brought down since then.

1600         Another FS was created on a different disk (hdisk10)
                and was mounted on the same mount point (/database).

1630         We restored the DBFs from the offline backup which
                were residing on that mount point (/database).

1640         Database startup mount. After that we issued a recover
                database which prompted for the archive files which
                were avilable on another disk and were applied. The Redo

                is also intact.

                What we see here is that it takes us to a point between
1523
                and 1535.

                Now when we try to open the database it says that one of

                the RBS files cannot be read. We tried commenting out
the
                rollback_segments from init.ora and then did startup
mount.
                Thereafter, we made the RBS files offline to see if the
                database will reopen. It fails with an error message :
                  ORA-00704: bootstrap process failure
                  ORA-00604: error occurred at recursive SQL level 1
                  ORA-00955: name is already used by an existing object

After all this now we have planned to restore all the files from offline

backup and use the current controlfile + redo + archives to do a PITR upto 1515 (few minutes before the disk failure) and then open the DB with resetlogs option and then take an offline backup immediately.

If you all can tell me the error we made in this process, it'll help. Also your advice if the second approach we are taking will work or not ?

TIA,
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