Re: Backup using only one CPU - SA wants to know why

From: Rich Jesse <>
Date: Mon, 12 Nov 2012 16:06:38 -0600 (CST)
Message-ID: <>

Sandy replied to Chris' post:

> I have a hunch it's something along those lines, but don't know how to
> prove it. My SA insists there's a setting in the database to "turn on
> multiple CPUs". If it already recognizes there are 5 of them, I'm not sure
> what else I can do.
> On Mon, Nov 12, 2012 at 1:53 PM, <> wrote:
>> According to my AIX admin (on a similar question I asked him about active
>> sessions) he said its because of the way IBM does CPU scheduling.

I don't do incrementals in EE on AIX 5.3, but I will confirm that using RMAN's "CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 4" uses UP TO 4 CPUs concurrently.

It should be noted that "parallel" here means "1 CPU per datafile". So if you only have one huge datafile, I wonder if incremental backups would only use 1 CPU...


Received on Mon Nov 12 2012 - 23:06:38 CET

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