On Mon, 02 Aug 2004 14:27:21 -0600, Daniel Fink <daniel.fink@xxxxxxx> wrote:
> If you can extract the performance problem from production and replicate it
> on a non-production system, is the 6x timing issue
> really an issue? If the 6x stays constant, then you can still compare apples
> to apples.
Unfortunately the factor by which times are increased is not constant.
The overhead comes from the row-source execution statistics which
means (in general) that operations that change between row sources
frequently will suffer to a greater extent than operations that don't.
So hash joins for example will look more desirable (to the analyst -
not the CBO) than NL.
--
Niall Litchfield
Oracle DBA
http://www.niall.litchfield.dial.pipex.com
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