RE: RMAN Incremental backups.

From: Mercadante, Thomas F <Thomas.Mercadante_at_Labor.State.Ny.Us>
Date: Wed, 06 Feb 2002 10:57:56 -0800
Message-ID: <F001.00407A89.20020206101829@fatcity.com>

Prasad,

Incremental backups are only valid if your database is in ARCHIVELOG mode. Think about it - to be able to recover using incremental backups, you *Need* the archivelog files to apply changes. These are not being created when you are running in NOARCHIVELOG mode.

Secondly, flipping between ARCHIVELOG and NOARCHIVELOG to perform Rman backups is a *total* waste of time. Again, you will not be able to use the backups to restore your database (except for the MOUNT/cold backups).

Your choices are:
Run in NOARCHIVELOG mode, and perform MOUNT/Rman or cold database backups. Run in ARCHIVELOG mode and perform Rman/database open backups.

or use older-style non-Rman backup methods.

I would not be flipping a production database back and forth between ARCHIVELOG/NOARCHIVELOG mode just to use Rman. Makes no sense.

Hope this helps.

Tom Mercadante
Oracle Certified Professional

-----Original Message-----
[mailto:Prasada.Gunda1_at_hartfordlife.com] Sent: Wednesday, February 06, 2002 11:58 AM To: Multiple recipients of list ORACLE-L

Hi All,

I am new to RMAN. I am reading RMAN documentation and doing some testing on our development box.

I have couple of questions.

Our database is in NOARCHIVE LOG mode and I would like to do Incremental backups. Since db is in noarchive log mode, I put the database in mount state and did the base level and incremental backups. Looks like it worked fine.

In one of the training documentation, it says 'Because the database is in noarchive log mode, the incrementals are

not applicable, so use the full backup option'.

It is contrary to what I did. Am I missing something here. please clarify me. Are the backups valid?

2. Since the database is in noarchive log mode, db is in mount state during full/incremental backup.

I want to keep the database open if possible and would like to know if the following procedure works to

keep the database open during the backup.

Shutdown the db before backup.
Bring back the db in ARCHIVE LOG mode.
Perform full/incremental backups (including archive log files) while the database is open.
Shutdown the db after backup is done.
Bring back the db in NOARCHIVE LOG mode.

I am not sure whether it makes sense or not. Please pass your suggestions.

Thanks in advance for your suggestions.
Best regards,
Prasad

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Author: Mercadante, Thomas F
INET: Thomas.Mercadante_at_Labor.State.Ny.Us

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