Re: [HACKERS] Another index "buglet"?

On Sat, 8 Jan 2000, Tom Lane wrote:

> The Hermit Hacker <scrappy@hub.org> writes:
> > Forbid merge:
> > Hash Join  (cost=9994.31 rows=2740488 width=36)
> >   -> Seq Scan on url  (cost=3368.58 rows=37866 width=20)
> >   -> Hash  (cost=3368.58 rows=37866 width=16)
> >     -> Seq Scan on url url2  (cost=3368.58 rows=37866 width=16)
> 
> > 0.900u 0.217s 0:04.19 26.4%     103+14638k 0+175io 0pf+0w
> 
> > Forbid Hash:
> > Merge Join  (cost=11188.76 rows=2740488 width=36)
> >   -> Index Scan using url_pkey on url url2  (cost=4347.30 rows=37866 width=16)
> >   -> Index Scan using url_referrer on url  (cost=4342.30 rows=37866 width=20)
> 
> > 0.897u 0.210s 0:03.19 34.4%     106+15120k 0+179io 0pf+0w
> 
> Thanks, but I'm confused about what I'm looking at here.  Are those
> time outputs for the backend, or for psql?

just from psql ...

> Also, how large are these two tables, and how many rows do you actually
> get from the query?

pgsql> grep http query.out | wc -l  37825

Can't give you a count on the tables though, since I've since had to
rebuiild them :(  Or, rather, the two tables are the same table...