On Wed, Aug 27, 2003 at 05:40:05PM -0400, Michael Guerin wrote:
> 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.
This particular form of query is a known performance problem for PostgreSQL
7.3 and earlier -- the problem should hopefully be fixed in 7.4 (currently
in beta). Check the archives for more discussion on this topic.
-Neil
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
