Re: Backup using only one CPU - SA wants to know why
- From: Sandra Becker <sbecker6925@xxxxxxxxx>
- To: David Fitzjarrell <oratune@xxxxxxxxx>
- Date: Mon, 12 Nov 2012 13:44:47 -0700
Oracle thinks it has 5 CPUs, which would be correct.
Sandy
On Mon, Nov 12, 2012 at 1:13 PM, David Fitzjarrell <oratune@xxxxxxxxx>wrote:
> One question I have is how many cpus does Oracle think there are?
>
>
> David Fitzjarrell
>
>
> *From:* Sandra Becker <sbecker6925@xxxxxxxxx>
> *To:* oracle-l <oracle-l@xxxxxxxxxxxxx>
> *Sent:* Monday, November 12, 2012 12:38 PM
> *Subject:* Backup using only one CPU - SA wants to know why
>
> Oracle 11.2.0.2
> SLES11 on IBM mainframe
> DB size - just below 1T
> I run an incremental 0 backup on my production OLTP once a week,
> incrementals the rest of the week. Recently changed the disk_asynch_io to
> TRUE and the filesystemio_options to SETALL, per recommendations from
> Oracle. I then added a channel to the backup scripts so it uses 4
> channels. These changes shaved 35 pecent off the time it takes to run the
> incr0 backup, which I am very happy with.
>
> The SA monitoring the performance of the mainframe says the incremental 0
> backup of our production OLTP is pegging a single CPU, out of 5 available.
> He thinks the backup would run even faster if it used more CPUs and
> suggested setting the PARALLELISM parameter to more than 1. Unbeknownst to
> him, it had been set to 3 for the past 6 years. He wants to know why the
> backup isn't using more CPUs. Any ideas/suggestions?
>
> --
> Sandy
> Transzap, Inc.
>
>
> --
> //www.freelists.org/webpage/oracle-l
>
>
>
>
>
--
Sandy
Transzap, Inc.
--
//www.freelists.org/webpage/oracle-l
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