Re: index not used

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От Litao Wu
Тема Re: index not used
Дата
Msg-id 20050421203927.72223.qmail@web30314.mail.mud.yahoo.com
обсуждение исходный текст
Ответ на index not used  (Enrico Weigelt <weigelt@metux.de>)
Список pgsql-performance
If id is PK, the query shoudl return 1 row only...
--- Enrico Weigelt <weigelt@metux.de> wrote:
>
> Hi folks,
>
>
> I'm doing a simple lookup in a small table by an
> unique id, and I'm
> wondering, why explains tells me seqscan is used
> instead the key.
>
> The table looks like:
>
>     id    bigint        primary key,
>     a    varchar,
>     b    varchar,
>     c     varchar
>
> and I'm quering: select * from foo where id = 2;
>
> I've got only 15 records in this table, but I wanna
> have it as
> fast as possible since its used (as a map between
> IDs and names)
> for larger queries.
>
>
> thx
> --
>
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>  Enrico Weigelt    ==   metux IT service
>
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> http://www.metux.de/
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>
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