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On Wed, Apr 19, 2017 at 12:17 AM, D*B <dieter.bender@xxxxxxxxxxxx> wrote:
describing the same ResultSet of complex queries in diffrent ways, should
not change the runtime of queries. If it does, it's no feature - it's a
side effect (and could change with every PTF).
Perhaps....but IMO, it's a side effect of the fact we aren't running IBM i
v30 on POWER100 quantum CPUs.
The optimizer has only so much time to figure out the best solution. As
the optimizer has gotten smarter and the hardware faster, it does a better
job. But there's still the possibility of a change that points it in the
right direction. Simple example, adding additional extraneous terms to a
WHERE.
Charles
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