Re: Queries joining views

Alban Hertroys wrote:
> Tom Lane wrote:
> I'm thinking that removing the indexes it's erroneously using now could
> help performance, as it can no longer use that index. It may however
> pick the primary key index (likely), or - if we remove even that one - a
> sequential scan... Experimenting will answer that.

Well, look at the attachhed explain output of:

zorgweb_solaris=> BEGIN;
DROP INDEX mm_insrel_full_idx; DROP INDEX mm_insrel_relation_idx;
EXPLAIN ANALYZE
SELECT
insrel.rnumber,insrel.dnumber,insrel.snumber,insrel.dir,insrel.number,medical_care_container.number,product.number
FROM mm_medical_care_container medical_care_container,
mm_insrel insrel,
mm_product product
WHERE medical_care_container.number=558332
AND (medical_care_container.number=insrel.dnumber
AND product.number=insrel.snumber AND insrel.dir<>1);
ROLLBACK;

Only 13ms as opposed to 130-ish :)

--
Alban Hertroys
alban(at)magproductions(dot)nl

magproductions b.v.

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