Re: Created Index is not used

Hi, Kjeld,

Kjeld Peters wrote:
> Select and update statements are quite slow on a large table with more
> than 600,000 rows. The table consists of 11 columns (nothing special).
> The column "id" (int8) is primary key and has a btree index on it.
>
> The following select statement takes nearly 500ms:
>
> SELECT * FROM table WHERE id = 600000;

Known issue which is fixed in 8.X servers, postgreSQL sees your 600000
as int4 literal and does not grasp that the int8 index works for it.

SELECT * FROM table WHERE id = 600000::int8;

should do it.

> SELECT version();
> "PostgreSQL 7.4.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.3.3
> (SuSE Linux)"

Btw, you should update to 7.4.12, there are importand bug fixes and it
is upgradable "in place", without dumping and reloading the database.

HTH,
Markus

--
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf.     | Software Development GIS

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