Reply-To: <lists@facnd.com>
From: "Rob Sell" <lists@facnd.com>
To: <pgsql-general@postgresql.org>
Subject: Re: Optimizing query
Date: Wed, 19 Nov 2003 07:44:06 -0600
Organization: Fargo Assembly Company
Message-ID: <003201c3aea3$33cc38b0$640101c0@rob>
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Importance: Normal

Greetings all,=20

Yesterday I upgraded from 7.3 to 7.4 now psql doesn't work! I get the
following error.=20

psql: relocation error: psql: undefined symbol: get_progname=20

Any ideas out there?

Rob

-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org] On Behalf Of Shridhar Daithankar
Sent: Wednesday, November 19, 2003 6:23 AM
To: Uros
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Optimizing query

Uros wrote:

> Hello!
>=20
> I have some trouble getting good results from my query.
>=20
> here is structure
>=20
> stat_views
> id        | integer
> id_zone   | integer
> created   | timestamp
>=20
>=20
> I have btree index on created and also id and there is  1633832 records in
> that table
>=20
> First of all I have to manualy set seq_scan to OFF because I always get
> seq_scan. When i set it to off my explain show:
>=20
> explain SELECT count(*) as views FROM stat_views WHERE id =3D 12;
>                                              QUERY PLAN
>
----------------------------------------------------------------------------
------------------------
>  Aggregate  (cost=3D122734.86..122734.86 rows=3D1 width=3D0)
>    ->  Index Scan using stat_views_id_idx on stat_views
(cost=3D0.00..122632.60 rows=3D40904 width=3D0)
>          Index Cond: (id =3D 12)
>=20
> But what I need is to count views for some day, so I use
>=20
> explain SELECT count(*) as views FROM stat_views WHERE date_part('day',
created) =3D 18;
>=20
>                                      QUERY PLAN
>
----------------------------------------------------------------------------
--------
>  Aggregate  (cost=3D100101618.08..100101618.08 rows=3D1 width=3D0)
>    ->  Seq Scan on stat_views  (cost=3D100000000.00..100101565.62 rows=3D=
20984
width=3D0)
>          Filter: (date_part('day'::text, created) =3D 18::double precisio=
n)
>=20
>=20
> How can I make this to use index and speed the query. Now it takes about
12
> seconds.

Can you post explain analyze for the same?

  Shridhar


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