effective_cache_size = 32000 # typically 8KB each
That is 256MB. You can raise it to 350+MB if nothing else is running on the box. Also if you have fast disk drives, you can reduce random page cost to 2 or 1.5.
I don't know how much this will make any difference to benchmark results but usually this helps when queries are slow.
HTH
Shridhar
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