> sort_mem is already 16384, which I thought would be plenty -- I tried
> increasing it to 65536 which made exactly zero difference. :-)

Well, then the next step is increasing the statistical sampling on the 3 join 
columns in that table.   Try setting statistics to 500 for each of the 3 
cols, analyze, and see if that makes a difference.

-Josh Berkus
 Aglio Database Solutions
 San Francisco

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