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  3. April 2003

Re: QQRYDEGREE

Most of the benefit of SMP applies to SQL & other query-ish activity. It appears it can be used for CPYFRMIMPF, as well. But not if you need RRNs to be the same in the copy.

Native I/O is not assisted much, if at all, IIRC. Please correct me if this is not the case.

A good reference is the Performance Mnagement Resource Library at <http://www-1.ibm.com/servers/eserver/iseries/perfmgmt/resource.htm>. Also, the iSeries DB2 page at <http://www-1.ibm.com/servers/eserver/iseries/db2/>

HTH

Vern

At 08:27 AM 4/18/2003 +0100, you wrote:
Lyle,

I always change this to *Optimize when I'm tuning clients - though so far
none has had SMP. It allows parallel pre-fetch of data, and seems to work
well.

Clare

Clare Holtham
Director, Small Blue Ltd - Archiving for BPCS
Web: www.smallblue.co.uk
IBM Certified AS/400 Systems Professional
E-Mail: Clare.Holtham@xxxxxxxxxxxxxx
Mobile: +44 (0)7960 665958
----- Original Message -----
From: <Lyle_Hart@xxxxxxxxxxxxxxxxxx>
To: <midrange-l@xxxxxxxxxxxx>
Sent: Thursday, April 17, 2003 8:16 PM
Subject: QQRYDEGREE


> We are looking at changing the sysval QQRYDEGREE  to *OPTIMIZE .  We have
> DB2 Symmetric Multiprocessing on one system.  We have multiple systems
with
> as many as 12 processors.
>
> Seems to me I looked at this system value a couple of years ago and there
> was a down side or it didn't help us because of the type of processing we
> do.  I am drawing a blank, any help?
>
> I looked in the archives, didn't find anything.
>
>



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