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RE: [Spam] Incremental backups

From: Mercadante, Thomas F \(LABOR\) <>
Date: Wed, 6 Dec 2006 09:30:29 -0500
Message-ID: <ABB9D76E187C5146AB5683F5A07336FFE0891F@EXCNYSM0A1AJ.nysemail.nyenet>


To me, and the place where I am working now, incremental backups before 10g do not make sense. While the amount of stuff that gets backed up is smaller, the time that rman runs does not change. A full backup and an incremental backup takes the same amount of time to run. So what am I getting for this? I might as well take a full backup.  

With 10g, incremental backups and the new change tracking file are a different story - something to investigate. The change tracking file keeps track of blocks that have changed within the database. Rman then uses this file to only back those blocks up during an incremental backup. This should be much faster.  

So until I get a 10g database running in production, incrementals are a no-go for me. They just don't make sense.  


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[] On Behalf Of Kline.Michael
Sent: Wednesday, December 06, 2006 9:14 AM To:
Subject: [Spam] Incremental backups  

Anyone have a sort of "working policy" at which point incremental backups are worth considering?  

Our system is still quite fast, and for the most part taking full is not that long and means we only need one copy or one set of files to restore.  

I would think, and yes I know it varies, that there is probably a size where it's really worth considering, like perhaps 1TB or so, maybe as low as 500Gb.  

I do have a couple of warehouses that I need to check what gets touched each day and they sound like very good candidates for this. We'd most likely do a full around the weekend, and do incremental cumulatives between that and the next. That way we only would need the base and the latest cumulative.  

Michael Kline
Database Administration
SunTrust Banks, Inc.
Mail Code TOC-7505

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Received on Wed Dec 06 2006 - 08:30:29 CST

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