Richard Huxton <[EMAIL PROTECTED]> writes:
> Things to check:
> 1. postgresql.conf settings match - different costs could cause this
> 2. statistics on the two columns (trn_patno,trn_old_date) - if they 
> differ considerably between systems that would also explain it.

The different estimated row counts could only come from #2.  I suspect
David has forgotten to run ANALYZE on the second system.

I agree that EXPLAIN VERBOSE output is not helpful...

                        regards, tom lane

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