Re: Parallel hint ignored only in subquery

From: "Rich Jesse" <rjoralist@xxxxxxxxxxxxxxxxxxxxx>
To: oracle-l@xxxxxxxxxxxxx
Date: Thu, 24 Jul 2008 14:33:17 -0500 (CDT)

I experiemented with the _optimizer_max_permutations parm at the session
level with no luck.  Then, I put a login trigger to:

alter session force parallel query parallel 3

...and the PQ works just fine.  It would seem to be hint-related then?

Rich


> Hey all,
>
> In 10.1.0.5.0 on AIX, I'm attempting to merge an app's "lookup" query with
> it's driving SQL, i.e. app currently runs nasty query, then runs a SELECT
> for each row returned.
>
> The query has 12 tables joined, with 10 of the 11 joins being outer (LEFT
> OUTER JOIN in ANSI syntax, if that matters).  From the explain plan, the
> driving table is obvious and I've successfully set a parallel hint on it's
> FTS for excellent runtime performance gains.

[snip]

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References:

Parallel hint ignored only in subquery
From: Rich Jesse

Re: Parallel hint ignored only in subquery

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