Re: Created Index is not used

Hi Markus,

first of all thanks for your quick reply!

Markus Schaber wrote:
> 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.

After I appended "::int8" to the query, selecting the table takes only
40-50ms. That's a great performance boost!

> 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.

I guess I'll test an upgrade to version 8.1.

Thanks again for your and Ragnar's help!

Kjeld