Re: PostgreSQL8.2.3 Performance

["Jonah H. Harris" <jonah(dot)harris(at)gmail(dot)com>]

Is there any reason you can't do something like this instead?

UPDATE produitscommandes
  SET prixvente = p.prixvente
 FROM produits p
WHERE produit = p.numero;

On 4/27/07, Martial Elise KIBA <mkiba(at)delgi(dot)gov(dot)bf> wrote:
> Hi all,
>
>
> I have a database running on POstgreSQL 8.2.3. The plpgsql functions were
> running well on my previous release.
>
> When i migrated to 8.2.3, I noticed some performance degradation, specially
> whith one of my function which makes an update to a table.
>
> Here is the code of the function
>
> CREATE OR REPLACE FUNCTION update1()
>   RETURNS varchar(50)
> AS
> $BODY$
> DECLARE
>         v_cur CURSOR FOR SELECT numero, prixvente FROM produits;
>         v_prixvente produitscommandes.prixvente%TYPE;
>         v_produit produits.numero%TYPE;
> BEGIN
>         OPEN v_cur;
>         LOOP
>                 FETCH v_cur INTO v_produit, v_prixvente;
>                 UPDATE produitscommandes SET prixvente=v_prixvente WHERE
> produit=v_produit;
>                 EXIT WHEN NOT FOUND;  -- Sortie de la boucle
>         END LOOP;
>         CLOSE v_cur;
>         RETURN 'mise à jour effectuée';
> END;
> $BODY$
>   LANGUAGE 'plpgsql' VOLATILE;
>
> ''######################################""
>
> produitscommandes has a primary key on commande and produit
> produitscommandes has 2 indexes on commande and produit
> produits has a primary key on numero
>
> When i call the function it takes a lot (it can take 30 minutes for
> approximatively 5 000 rows in produitscommandes and 3 000 in produits)
>
> thanks all for your help.
>
> PS: tried vaccum and analyse on table produitscommandes
>
> Martial E. W. KIBA
> Ingénieur de Conception en Informatiques
> Option Génie-Logiciel
> Tél: (+226) 70 15 44 93
> Mail: mkiba(at)delgi(dot)gov(dot)bf / mkiba01(at)yahoo(dot)fr
>
>
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--
Jonah H. Harris, Software Architect | phone: 732.331.1324
EnterpriseDB Corporation            | fax: 732.331.1301
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Iselin, New Jersey 08830            | http://www.enterprisedb.com/