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I believe I've read somewhere that having automatic performance adjustment
on can have an adverse effect on query optimization. Because when the
query optimizer runs it ignores the previous optimization analysis and
reanalyzes if the memory changes because the memory available is taken
into the calculation. So, if you have like a million sql statements in a
loop (canned vendor package) each time it loops it may have to reanalyze
because the memory changes, well maybe not every loop because the adjuster
is not quite that fast to recalculate.

I have a PMR open with IBM and they are looking at Job Watcher data and
now have moved on into SQL plan cache but while waiting on that I wanted
to explore other things.

Also, on a closely related note, does having your paging set *CALC vs
*FIXED affect query optimization?
See WRKSYSSTS and WRKSHRPOOL


Rob Berendt

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