Re: Simple queries take forever to run - Mailing list pgsql-performance

> postgresql version 7.3.3
> .conf params changed from defaults.
> shared_buffers = 64000
> sort_mem = 64000
> fsync = false
> effective_cache_size = 400000
>
> ex. query: select * from x where id in (select id from y);
>
> There's an index on each table for id.  SQL Server takes <1s to return,
> postgresql doesn't return at all, neither does explain analyze.
> x has 1200673 rows
> y has 1282 rows
>
> It seems like its ignoring the index and not using enough memory.. any
> ideas?

This is a known problem in 7.3, it is much faster in 7.4b1.  This should be
very, very fast though, and do exactly the same thing:

select * from x where exists (select id from y where y.id=x.id);

Chris