Re: optimizer parameters

  • From: Jared Still <jkstill@xxxxxxxxx>
  • To: greg@xxxxxxxxxxxxxxxxxx
  • Date: Mon, 25 Apr 2011 08:09:53 -0700

On Sun, Apr 24, 2011 at 8:38 PM, Greg Rahn <greg@xxxxxxxxxxxxxxxxxx> wrote:

> The problem with this vendor's recommendation is "problem scope".  The
> scope of the problem here is query, but the scope of the suggested
> solution is global - that's a mismatch.  Tuning "a" query should not
> involve making global changes.  What this vendor is not considering
> (nor measuring) is the global impact of changing these optimizer
> parameters on all the other statements that run on this database.
> Modifying these parameters until the "good" plan is chosen is
> certainly possible, but who is keeping track of how many other
> regressions there might be?  So, scope of the problem must match with
> scope of the solution.
It appear that some of you have not had to deal much with SAP folks.

OICA and OIC *will* be set to SAP recommendations.

Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
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