Benjamin Arai <[EMAIL PROTECTED]> writes:
> I would prefer not to drop the index because the database is several 
> hundred gigs.  I would prefer to incrementally add to the index.

This may well be false economy.  I don't have numbers at hand, but a
full rebuild can be substantially faster than adding a large number
of rows to the index incrementally.  Also, you don't end up with a
physically disordered index, so there is some ongoing performance
benefit.

                        regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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