RE: CBO irregularity
- From: "Jacques Kilchoer" <Jacques.Kilchoer@xxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 7 Jun 2004 16:31:06 -0700
When would up-to-date statistics not be valid? Do you mean, for example,
a different number of histograms or different sample sizes were
collected with the "up-to-date" statistics?
-----Original Message-----
Daniel Fink
...
If you don't have valid (not the
same as up-to-date) statistics on all the objects (and corollary
objects) referenced in the query, you might get some defaults that
are unrealistic or it may perform dynamic sampling.
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