Joey,

> shared_buffers = 1000
> sort_mem = 1024
> effective_cache_size = 1000

effective_cache_size should be much higher, like 3/4 of your available RAM.  
This is probably the essence of your planner problem; the planner thinks you 
have no RAM.

> I see a similar speedup (and change in query plan) using "LIMIT 1
> OFFSET <anything besides 0>".

So what's your problem?

-- 
--Josh

Josh Berkus
Aglio Database Solutions
San Francisco

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