Re: [HACKERS] JOIN between three *simple* tables ...

Okay, now I'm annoyed ... I *swear* I ran VACUUM ANALYZE a couple of times
since populating those tables *sigh*  now its bringing up indices I'm
expecting :(

On Wed, 6 Feb 2002, Tom Lane wrote:

> "Marc G. Fournier" <scrappy@hub.org> writes:
> > iwantu=# \d poc_uid
> >  Index "poc_uid"
> >  Column |  Type
> > --------+--------
> >  uid    | bigint
> > btree
>
> > iwantu=# explain select count(1) from orientation_c poc where uid = 1;
> > NOTICE:  QUERY PLAN:
>
> > Aggregate  (cost=2264.97..2264.97 rows=1 width=0)
> >   ->  Seq Scan on orientation_c poc  (cost=0.00..2264.96 rows=1 width=0)
>
> > EXPLAIN
>
> You're forgetting ye olde constant-casting problem.  You need something
> like
>
>     select count(1) from orientation_c poc where uid = 1::bigint;
>
> to use an index on a bigint column.
>
> Not sure about the other thing; have you VACUUM ANALYZEd (or at least
> ANALYZEd) since filling the tables?  It looks like the system thinks
> the tables are much smaller than they really are.
>
>             regards, tom lane
>