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RE: RMAN question(s)

From: Robert Freeman <>
Date: Tue, 2 Oct 2007 21:02:24 -0600
Message-ID: <>

Quite a nice improvement there! I would caution everyone to carefully test of course, but it seems to have worked well here. I would expect that recoveries may well go faster too.


Robert G. Freeman
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Principal Engineer/Team Manager
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-----Original Message-----

[]On Behalf Of Allen, Brandon Sent: Tuesday, October 02, 2007 5:04 PM
To:; Subject: RE: RMAN question(s)

Just an update on this - after running the compressed backups on this database and another one for 3 weeks now, they are consistently running much faster than before the compression - a little less than half the time they used to take, and the size of the backups is consistently reduced by about 87%. Pretty nice, thanks for the tip Robert!

Now to test the restores before I implement on my production database . . .

-----Original Message-----

From: Allen, Brandon

In case anyone is interested - I did a test of the 10g "as compresssed" backupset on a 285GB databases and here are the results:

W/O Compression: backup size = 280GB, backup time = 2 to 10 hours with an average of about 7.5 hours over the past 3 months (this goes to a disk staging area and later to tape on a Netbackup server with a LOT of other backup activity so there is a wide variance in backup times depending on what else is running at the same time)

W/ Compression: backup size = 36GB, backup time = 2.9 hours (only tested once so far)

Environment: AIX 5.3, Oracle, Netbackup 5.1 MP4, BaanIV ERP application data

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-- Received on Tue Oct 02 2007 - 22:02:24 CDT

Original text of this message