RE: Bring up of Cold Backup of RAC Database as NON-RAC Database, with a Few Missing Datafiles ?

From: VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com>
Date: Thu, 25 Oct 2007 02:04:26 +0530
Message-ID: <69E1360E54B50C4A828A136C158E474203671D8951@BLRKECMBX02.ad.infosys.com>

Thanks Romas, folks for responding

My Qs is embedded below into your e-mail, preceded by =>

Do feel free to correct my following 2 stated Approaches, as needed.

Cheers

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From: Roman Podshivalov [mailto:roman.podshivalov_at_gmail.com] Sent: Wednesday, October 24, 2007 11:00 PM

Cold backup is consistent if done right. Why do you want to do a recovery ? Missing datafiles should be dropped with offline option

=> Qs - Since Missing Datafiles can only be Dropped in the MOUNT Stage, which Control file is being used to Mount the Database? Is it the existing RAC Controlfile extracted from Cold Backup Tape (Approach 1) OR the NEWLY Created Controlfile (Approach 2)

and online redolog files for all threads renamed to existing location. After that you should be able to open database with resetlogs.

--romas

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From: ... On Behalf Of VIVEK_SHARMA

Folks

Qs For Bring up of Cold Backup of RAC Database as a NON-RAC Database (with a Few Missing Datafiles) is RE-Creation of Control file mandatory?

CASE DETAILS - Cold backup was taken from a Testing RAC (NOT production) Database (version 10.2.0.2) into Tapes & Database Deleted from respective machine. The Tapes were extracted into a machine having only a NON-RAC ORACLE_HOME (Same version 10.2.0.2) but into a Different Directory Structure (versus that from which backup was taken). 25 datafiles were to be found missing in the Backup Tapes

AIM To Bring UP the Database in its present Condition.

Approach 1

Qs - Is Controlfile RE-Creation Mandatory? If NOT so, Will the following Steps Work?

1 - Using NON-RAC ORACLE_HOME (Same Version)
2 - Set cluster_database=FALSE, _no_recovery_through_resetlogs=TRUE in NON-RAC init.ora
3 - Using extracted RAC Controlfile, STARTUP MOUNT
4 - Update the same controlfile by issuing "ALTER DATABASE RENAME FILE 'Old Path' TO 'New Path';
5 - To RE-Create Online Redo Logs issue "RECOVER DATABASE USING BACKUP CONTROLFILE" followed by "ALTER DATABASE OPEN RESETLOGS". Will this Step 5 succeed or FAIL ?

Approach 2 - If Controlfile RE-Creation is Mandatory, Will the following Steps Work?

1 - Using NON-RAC ORACLE_HOME (Same Version)
2 - Set cluster_database=FALSE, _no_recovery_through_resetlogs=TRUE in NON-RAC init.ora
3 - Edit the Control file to Trace SQL Script to Remove the Missing Datafile names & RE-Create the Controlfile after STARTUP NOMOUNT
4 - To RE-Create Online Redo Logs issue "ALTER DATABASE OPEN RESETLOGS"
5 - Datafiles whose names were purposely Removed from the Controlfile Trace will appear as "MISSINGnnnnnn"
6 - Is Dropping of these ""MISSINGnnnnnn" datafiles possible?

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Received on Wed Oct 24 2007 - 15:34:26 CDT