2006/12/5, Scott Marlowe <smarlowe@g2switchworks.com>:
> On Tue, 2006-12-05 at 16:32, Tomi N/A wrote:
>
> > One type of query does come to mind, now that I think about it.
> > pgsql has trouble handling queries like
> > SELECT * FROM t0 WHERE t0.id_t1 IN (SELECT t1.id FROM t1 WHERE...)
>
> > When the subselect returns a lot of results, pgsql really takes it's time.
>
> Just wondering what version of pgsql you were using, as the in()
> performance has been greatly improved in the newer versions.
8.1.something
> What I noticed was that PostgreSQL was better under parallel load than
> MSSQL server was. Our pgsql 7.2 server would routinely outrun the MSSQL
> server (This was like 3 years ago) when they were both moderately
> loaded. Of course, we didn't run a lot of where in () queries on the
> pgsql server, we re-worked them to favor postgresql's query planner of
> the time.
We frequently run into the same basic RDBMS benchmarking problem:
basically any database can be fastest in a given context, depending on
how the query is expressed and what it does.
Cheers,
t.n.a.