From: | Antonis Antoniou <a(dot)antoniou(at)albourne(dot)com> |
---|---|
To: | Ricardo Ryoiti Sugawara Junior <suga(at)netbsd(dot)com(dot)br> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Indexes not working, please help. |
Date: | 2002-07-05 06:58:27 |
Message-ID: | 3D254393.9420BD20@albourne.com |
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Lists: | pgsql-general |
Ricardo Ryoiti Sugawara Junior wrote:
> Hi there.
>
> The table medidas has the following structure:
>
> Table "medidas"
> Column | Type | Modifiers
> ------------+-----------------------------+-----------------------------------------------------
> cod | bigint | not null default
> nextval('"medidas_cod_seq"'::text)
> cod_ponto | bigint |
> data_hora | timestamp without time zone |
> valor | smallint |
> tipo_ponto | bytea |
> unidade | bytea |
> Indexes: teste
> Primary key: medidas_pkey
>
> I populated it with 8859000 entries using many "100 inserts"
> blocks transactions. Inserting data on the table is no problem.
> Althought I created the "teste" index ( create index teste on
> medidas (cod) ), vacuumed and analyzed the database, pgsql still doesn't
> use indexes.
>
> explain select * from medidas where cod = 1231232;
> ---
> NOTICE: QUERY PLAN:
>
> Seq Scan on medidas (cost=0.00..197590.50 rows=1 width=36)
> ---
>
> I've read all the documentation I found, but I couldn't figure out
> what's happening. Setting "enable_seqscan" to false doesn't help either.
> This machine I'm working on won't be the production server, but
> it's not that slow machine (P3 1GHz, 384MB, ATA 100) and without indexes
> working, that select mentioned above takes almost 60 seconds to run...
>
>
Hi,
Is your index on the attribute cod? If not then try this:
CREATE INDEX teste ON medidas (cod);
Thanks
Antonis
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