RE: Implement Parallel Processing on DB Warehouse
- From: John Kanagaraj <john.kanagaraj@xxxxxxx>
- To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 10 Feb 2004 15:48:31 -0800
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@xxxxxxxxxxxxx
>[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Freeman, Donald
>Sent: Tuesday, February 10, 2004 1:18 PM
>To: oracle-l@xxxxxxxxxxxxx
>Subject: Implement Parallel Processing on DB Warehouse
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