From: Julius Tuskenis <julius@nsoft.lt>
To: pgsql-admin@postgresql.org
Subject: function executes sql 100 times longer it should
Date: Wed, 12 Nov 2008 16:10:58 +0200
Message-ID: <491AE3F2.601@nsoft.lt> (raw)
Hello, list.
I have one simple SQL function returning result set that takes around 3
seconds to execute. But if I execute the Select it executes directly -
it takes only around 30 ms. Why so big difference? What should I check?
I must also say, that this started this afternoon.
PG: 8.3.3
OS: Windows Server 2003
Example below:
//========================================================================================================
CREATE OR REPLACE FUNCTION fnk_grupes_prekes(prm_pardavimo_taskas
integer, prm_grupe integer, prm_filtras character varying)
RETURNS SETOF frt_grupes_prekes AS
$BODY$SELECT DISTINCT prek_id, prek_pavadinimas, ks_kaina, mvnt_trumpinys
FROM filter_b_preke_matoma()
LEFT OUTER JOIN b_grupes_prekes ON (gp_preke=prek_id)
LEFT OUTER JOIN b_grupe ON (gp_grupe=grup_id)
JOIN b_mato_vienetai ON (mvnt_id=prek_matovnt)
JOIN b_kainorascio_sudetis ON (ks_preke = prek_id)
JOIN b_kainorascio_grafikas ON (ks_kainorastis=kag_kainorastis)
JOIN b_pardavimo_tasko_kainorastis ON (ks_kainorastis=ptk_kainorastis)
WHERE (grup_id=$2 OR $2 is Null)
AND ptk_pardavimotaskas=$1
AND ((prek_pavadinimas ILIKE ('%'||$3||'%')) OR $3 is NULL)
AND fnk_grafikas_galioja(kag_grafikas) = true
ORDER BY prek_pavadinimas
$BODY$
LANGUAGE 'sql' VOLATILE
COST 100
ROWS 1000;
ALTER FUNCTION fnk_grupes_prekes(integer, integer, character varying)
OWNER TO postgres;
GRANT EXECUTE ON FUNCTION fnk_grupes_prekes(integer, integer, character
varying) TO postgres;
GRANT EXECUTE ON FUNCTION fnk_grupes_prekes(integer, integer, character
varying) TO public;
select * from fnk_grupes_prekes(18,42,NULL);
Total query runtime: 2172 ms.
0 rows retrieved.
SELECT DISTINCT prek_id, prek_pavadinimas, ks_kaina, mvnt_trumpinys
FROM filter_b_preke_matoma()
LEFT OUTER JOIN b_grupes_prekes ON (gp_preke=prek_id)
LEFT OUTER JOIN b_grupe ON (gp_grupe=grup_id)
JOIN b_mato_vienetai ON (mvnt_id=prek_matovnt)
JOIN b_kainorascio_sudetis ON (ks_preke = prek_id)
JOIN b_kainorascio_grafikas ON (ks_kainorastis=kag_kainorastis)
JOIN b_pardavimo_tasko_kainorastis ON (ks_kainorastis=ptk_kainorastis)
WHERE (grup_id=42 OR 42 is Null)
AND ptk_pardavimotaskas=18
AND ((prek_pavadinimas ILIKE ('%'||null||'%')) OR null is NULL)
AND fnk_grafikas_galioja(kag_grafikas) = true
ORDER BY prek_pavadinimas;
Total query runtime: 47 ms.
0 rows retrieved.
--
Julius Tuskenis
Programavimo skyriaus vadovas
UAB nSoft
mob. +37068233050
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To: pgsql-admin@postgresql.org
Cc: julius@nsoft.lt
Subject: Re: function executes sql 100 times longer it should
In-Reply-To: <491AE3F2.601@nsoft.lt>
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