> effective_cache_size = 1000000  # typically 8KB each

I have this setting on postgresql 7.4.8 on FreeBSD with 4 GB RAM:

effective_cache_size = 27462

So eventhough your machine runs Debian and you have four times as much
RAM as mine your effective_cache_size is 36 times larger. You could
try lowering this setting.

regards
Claus

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