PQ_DISTRIBUTE Usage in NON Parallel Queries
- From: "Larry Elkins" <elkinsl@xxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 4 Feb 2005 19:41:41 -0600
Listers,
In what way does the PQ_DISTRIBUTE "hint" apply to non parallel queries? I
ran into a need to use a stored outline a while back. And the query does not
use parallelism. When capturing the desired plan in the OL$HINTS table for
the outline there is a PQ_DISTRIBUTE hint. The docs categorize it as a
parallel related hint, and I've had to use it a couple of times in the past
related to parallel queries for huge batch jobs (and yes, I tried tweaking
stats first ;-)).
This actually came up a couple of months ago, and I no longer have access to
the system or else I would dig into it a bit more, and even provide the SQL,
it's plan, and the data from OL$HINTS to the list. But no can do without
access to it. I just find it odd that the docs, and whatever else Oracle
puts out on Metalink, etc, that it is always referred to as being a parallel
related hint. Yet it appears in OL$HINTS for a SQL statement not using
parallelism.
Oh yeah, 9.2.0.5 EE. And I'm going to see if I can duplicate on 8i and 9i
here at home, but thought I would throw the question out to the list as
well.
Regards,
Larry G. Elkins
elkinsl@xxxxxxxxx
214.954.1781
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