Differences when calling query inside and outside cursor - Mailing list pgsql-general
From | Carlos Henrique Reimer |
---|---|
Subject | Differences when calling query inside and outside cursor |
Date | |
Msg-id | CAJnnue1VXqujBk76mmcK5D6t4Wp-BEAanR_0E-H6sYrFy2009g@mail.gmail.com Whole thread Raw |
Responses |
Re: Differences when calling query inside and outside cursor
(Carlos Henrique Reimer <carlos.reimer@opendb.com.br>)
Re: Differences when calling query inside and outside cursor (Albe Laurenz <laurenz.albe@wien.gv.at>) |
List | pgsql-general |
Hi, We're facing a weird performance problem in one of our PostgreSQL servers running 8.0.26. What can explain the difference between calling same query inside and outside a cursor? If we run the query outside a cursor we got a response time of 755ms and 33454ms if we call the same query inside a cursor. I suspect the query called inside the cursor is using a different plan than the same query outside a cursor. Is there a way to confirm this suspicion? Query called outside a cursor: pgipm=3D# explain analyze SELECT XMAX, ANO, MES, CODFUNC, SEQFUNC, TIPOPGTO= , CODPD, HRSPD, VLRPD, MESANO, TIPOCALCFERIAS, VLRBASE FROM fparq.cadpag where (ANO >'2013') or (ANO =3D'2013' and MES >'01') or (ANO =3D'2013' = and MES =3D'01' and CODFUNC >'0000029602') or (ANO =3D'2013' and MES =3D'01'= and CODFUNC =3D'0000029602' and SEQFUNC >'02') or (ANO =3D'2013' and MES =3D= '01' and CODFUNC =3D'0000029602' and SEQFUNC =3D'02' and TIPOPGTO > (' ')) = or (ANO =3D'2013' and MES =3D'01' and CODFUNC =3D'0000029602' and SEQFUNC = =3D'02' and TIPOPGTO =3D (' ') and CODPD >'000') order by ANO ASC, MES ASC, CODFUNC ASC, SEQFUNC ASC, TIPOPGTO ASC, CODPD ASC; QUERY PLAN ---------------------------------------------------------------------------= ---------------------------------------------------------------------------= ---------------------------------------------------------------------------= ---------------------------------------------------------------------------= ---------------------------------------------------------------------------= ---------------------------------------------------------------------------= ---------------------------------------------------------------------------= ---------------------------------------------------------------------------= ------ Sort (cost=3D151845.90..152304.21 rows=3D183322 width=3D62) (actual time=3D706.676..728.080 rows=3D32828 loops=3D1) Sort Key: ano, mes, codfunc, seqfunc, tipopgto, codpd -> Index Scan using pagpk_aux_mes, pagpk_aux_mes, pk_cadpag, pk_cadpag, pk_cadpag, pagchavefunc00 on cadpag (cost=3D0.00..131521.88 rows=3D183322 width=3D62) (actual time=3D0.664..614.080 rows=3D32828 loops=3D1) Index Cond: ((ano > 2013::smallint) OR ((ano =3D 2013::smallint) A= ND (mes > 1::smallint)) OR ((ano =3D 2013::smallint) AND (mes =3D 1::smallint)= AND (codfunc > 29602::bigint)) OR ((ano =3D 2013::smallint) AND (mes =3D 1::smallint) AND (codfunc =3D 29602::bigint) AND (seqfunc > 2::smallint)) O= R ((ano =3D 2013::smallint) AND (mes =3D 1::smallint) AND (codfunc =3D 29602::bigint) AND (seqfunc =3D 2::smallint) AND ((tipopgto)::text > ' '::text)) OR ((codfunc =3D 29602::bigint) AND (seqfunc =3D 2::smallint) AND ((tipopgto)::text =3D ' '::text) AND (codpd > 0::smallint) AND (ano =3D 2013::smallint) AND (mes =3D 1::smallint))) Filter: ((ano > 2013::smallint) OR ((ano =3D 2013::smallint) AND (mes > 1::smallint)) OR ((ano =3D 2013::smallint) AND (mes =3D 1::smallint)= AND (codfunc > 29602::bigint)) OR ((ano =3D 2013::smallint) AND (mes =3D 1::smallint) AND (codfunc =3D 29602::bigint) AND (seqfunc > 2::smallint)) O= R ((ano =3D 2013::smallint) AND (mes =3D 1::smallint) AND (codfunc =3D 29602::bigint) AND (seqfunc =3D 2::smallint) AND ((tipopgto)::text > ' '::text)) OR ((ano =3D 2013::smallint) AND (mes =3D 1::smallint) AND (codfu= nc =3D 29602::bigint) AND (seqfunc =3D 2::smallint) AND ((tipopgto)::text =3D ' '::text) AND (codpd > 0::smallint))) Total runtime: 755.878 ms (6 rows) ___________________________________________________________________________= _____________________________________________________________________ Query called inside a cursor: pgipm=3D# select current_time; timetz -------------------- 10:51:39.747798-02 (1 row) pgipm=3D# BEGIN WORK; BEGIN pgipm=3D# DECLARE CUR1 CURSOR FOR pgipm-# SELECT XMAX, ANO, MES, CODFUNC, SEQFUNC, TIPOPGTO, CODPD, HRSPD, VLRPD, MESANO, TIPOCALCFERIAS, VLRBASE FROM fparq.cadpag where (ANO >'2013') or (ANO =3D'2013' and MES >'01') or (ANO =3D'2013' and MES =3D= '01' and CODFUNC >'0000029602') or (ANO =3D'2013' and MES =3D'01' and CODFUNC =3D'0000029602' and SEQFUNC >'02') or (ANO =3D'2013' and MES =3D'01' an= d CODFUNC =3D'0000029602' and SEQFUNC =3D'02' and TIPOPGTO > (' ')) or (= ANO =3D'2013' and MES =3D'01' and CODFUNC =3D'0000029602' and SEQFUNC =3D'02= ' and TIPOPGTO =3D (' ') and CODPD >'000') order by ANO ASC, MES ASC, CODFUN= C ASC, SEQFUNC ASC, TIPOPGTO ASC, CODPD ASC; DECLARE CURSOR pgipm=3D# FETCH FORWARD 2 FROM CUR1; xmax | ano | mes | codfunc | seqfunc | tipopgto | codpd | hrspd | vlrpd | mesano | tipocalcferias | vlrbase ------+------+-----+---------+---------+----------+-------+--------+-------= --+--------+----------------+--------- 0 | 2013 | 1 | 29602 | 2 | R | 0 | 220.00 | 1743.28 | 12013 | | 0.00 0 | 2013 | 1 | 29602 | 2 | R | 53 | 14.67 | 116.22 | 12013 | | 0.00 (2 rows) pgipm=3D# select current_time; timetz -------------------- 10:51:39.748351-02 (1 row) pgipm=3D# rollback; ROLLBACK pgipm=3D# select current_time; timetz -------------------- 10:52:13.202640-02 (1 row) pgipm=3D# Thank you! Reimer
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