Ligia,
> Anyhow,... I found that if I write more restrictions on the same
> query, like
> another where, the query responds as I expect. Maybe I was writing
> something
> wrong.
Then it's definitely symptomatic of a memory config problem. I'd say
that when queries get very large, pgsql is trying to use memory that
doesn't exist. Possibilites: you've set shared_buffers or sort_mem much
too high; your machine is chronically low on memory; you have some kind
of kernel config problem; you have a bad RAM card.
Good luck on figuring out which.
-Josh
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