RE: Unable to rebuild database from hot backup

Is this recovery method valid? The loss of controlfiles is supposed to be recovered using the trace file generated from a previous BACKUP CONTROLFILE TO TRACE, isn't it? At least according to the Oracle8 Backup and Recovery class it is.

The part that concerns me is that you are recovering using an ONLINE redo log (don't know if it was the active one or not). Could be the paranoid in me, but that just doesn't seem right. The admission that "I don't think this is 100% true for every situation" would seem to suggest that you agree that this method shouldn't be used for backup/recovery on production databases.

My $.02.

Rich Jesse                          System/Database Administrator
Rich.Jesse_at_qtiworld.com             Quad/Tech International, Sussex, WI USA

-----Original Message-----
Sent: Friday, October 26, 2001 08:30
To: Multiple recipients of list ORACLE-L

Tim,

> You can not simply cancel a "recover
> database using backup
> controlfile" since Oracle is expecting you perform a
> complete recovery (
> since your not using the UNTIL CANCEL/TIME/CHANGE )
> and canceling a complete
> recovery leaves the stop SCN in the controlfile at
> infinity... Therefore,
> the recovery is never complete and you will always
> receive the "needs media
> recovery message"...

I don't think this is 100% true for every situation. I am no recovery expert, but I just did this the other day, and to verify it, I ran the test again this morning.

1. Shutdown abort
2. Delete all current controlfiles
3. Replaced the binary controlfiles from last hot backup (they were copied as part of the backup script)
4. Startup mount
5. Recover database using backup controlfile
6. Kept applying logs - only trick was that the last log was an online redo log, so I had to type in that log explicitly. There I received the message Media Recover Complete.
7. Alter database open resetlogs.

Rob Pegram
Oracle Certified DBA

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Author: Jesse, Rich
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