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rob@xxxxxxxxx wrote:
However, if I add this "standard" logical
R IIMJOER PFILE(IIMJOE)
IPROD 25A
K IPROD
Against that same physical file then you will see the same times.
12.199
13.313
12.277
So, why not just have the UNIQUE key on the physical?
My response to this would be to put the primary key on the physical file
where it belongs.
And I'm not sure why this causes such a change. In fact, this is a real
problem as far as I'm concerned. It's one of the few places where a
DDL-defined file seriously underperforms a DDS-defined file. Even
creating a non-unique index using CREATE INDEX still causes the very
nasty 7-to-1 perform decrease.
It seems that the logic that allows a physical file to be keyed is much
faster than a separate index object (i.e. logical file), and that SQL
always uses a separate index object. That's a painful reality. I
normally recommend DDL files over DDS files because up until now there
was no reason not to. However, it seems that you're stuck with that
performance hit in DDL.
Ouch. Score a big one for DDS.
Joe
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