Re: Creating Histograms
- From: Tanel Põder <tanel.poder.003@xxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Sat, 24 Jul 2004 14:29:47 +0300
> I think someone explained you may not always get same plan. One
> reason is CBO still looks at table HWM. But it's still worth doing.
CBO doesn't look at table's real HWM when optimizing a query, it uses the
stats from the point in time when they were gathered. When stats (including
system stats), optimizer parameters (including *_area_sizes) and real values
in predicates stay constant, then the execution plan should stay the same
for a given query, unless you encounter some bugs...
Tanel.
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