RE: Implement Parallel Processing on DB Warehouse

From: John Kanagaraj <john.kanagaraj_at_hds.com>
Date: Tue, 10 Feb 2004 15:48:31 -0800
Message-ID: <35CFD500D7BDCE43B9030BBA5979DC181D92C8@ussccem13.hds.com>

Don,

As Jonathan pointed out, AUTOTRACE cannot be relied upon. Rather, I would look at V$SESSTAT from another session for the identified SID - this provides some additional details, especially about PQ. Specifically, look for Statistics (join V$STATNAME) 'where upper(name) like '%PARALLEL%'' - you will be gently surprised s'all I can say :) You also did not mention the number of CPUs you have (although I note that you have set parallel_threads_per_cpu). Be aware that although you did not set LARGE_POOL, this will automatically be derived.

And I have to disagree with Mladen here on the flushing bit - since this is a DW, I wouldn't mind flushing the shared pool, as I can understand why you did it. Of course, he did point out the syntax error!

PQ (in a controlled fashion) can be a boon in DWs, but I have seen it really bite in an OLTP environment.
John Kanagaraj
DB Soft Inc
Phone: 408-970-7002 (W)

Listen to great, commercial-free christian music 24x7x365 at http://www.klove.com

The opinions and facts contained in this message are entirely mine and do not reflect those of my employer or customers **

>-----Original Message-----
>From: oracle-l-bounce_at_freelists.org
>[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Freeman, Donald
>Sent: Tuesday, February 10, 2004 1:18 PM
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>Subject: Implement Parallel Processing on DB Warehouse

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Received on Tue Feb 10 2004 - 17:48:31 CST