Mark,
> I've got one question about query planning. Is it understandable to
> have the query plan estimation be off by a couple of orders of
> magnitude? Or, is it the fact that the cost estimation is small to
> begin with that the error between the actual and the estimated is
> "normal"?
Well, your example is not "a couple orders of magnitude". 6 vs. 32 is
actually pretty good accuracy.
Now, 6 vs 192 would potentially be a problem, let alone 32 vs 13,471.
--
-Josh Berkus
Aglio Database Solutions
San Francisco