Am Donnerstag, 31. August 2006 15:06 schrieb Jeroen T. Vermeulen:
> Is there any kind of pattern at all to this problem?  Anything
> recognizable?  A few typical pitfalls?

If data is not distributed evenly, then any old WHERE foo = $1 is prone to be 
the wrong plan for half of the possible values of $1.  The more data you have 
and the more it changes, the worse this gets.

Peter Eisentraut

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