In Oracle 
analyze table <table name> compute statistics for all indexed columns 
+size 254;

[download]
with generate a histogram of weightings for each range of values that are in the indexed columns. Parse trees can be generated on a case by case basis. In the latest versions you can "fake" the stats to get the optimizer to behave properly.

rdfield

In reply to Re: Re: Re: Use Placeholders. For SECURITY and (sometimes) for PERFORMANCE by rdfield
in thread Use Placeholders. For SECURITY and (sometimes) for PERFORMANCE by jZed

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