pg.ddx.io pgsql-sql@postgresql.org mailing list archive help / color / mirror / Atom feed From: Markus Bertheau <mbertheau.pg@googlemail.com>
To: Maciej Piekielniak <piechcio@isb.com.pl>
Cc: pgsql-sql@postgresql.org
Subject: Re: How to optimize this query?
Date: Thu, 23 Mar 2006 00:27:07 +0600
Message-ID: <684362e10603221027t354b079bh@mail.gmail.com> (raw )
In-Reply-To: <1731392587.20060322191801@isb.com.pl >
References: <827987076.20060322181715@isb.com.pl >
<684362e10603220958s2dac37cfp@mail.gmail.com >
<1731392587.20060322191801@isb.com.pl >
That's an explain. We need explain analyze.
2006/3/23, Maciej Piekielniak <piechcio@isb.com.pl>:
> Hello Markus,
>
> Wednesday, March 22, 2006, 6:58:44 PM, you wrote:
>
> MB> Send an EXPLAIN ANALYZE of the query along with the description of the
> MB> involved tables. Also hardware information (RAM, disks, CPU), what
> MB> other applications are running on that box and the parameter values in
> MB> postgresql.conf that you changed from the defaults would be
> MB> interesting.
>
>
> Sort (cost=21413847.71..21413867.37 rows=7864 width=107)
> Sort Key: dostawcy.id_dostawcy
> -> Group (cost=1360.03..21413073.50 rows=7864 width=107)
> -> Sort (cost=1360.03..1379.69 rows=7864 width=107)
> Sort Key: towar.id_towar, towar.key2, towar.nazwa, towar.min1, towar.max1, towar.ilosc_jed, towar.ilosc_nom, dostawcy.id_dostawcy, jednostka_miary.jednostka, towar.ilosc_paczkowa, towar.key1
> -> Hash Left Join (cost=2.21..585.81 rows=7864 width=107)
> Hash Cond: ("outer".id_jednostka_miary = "inner".id_jednostka_miary)
> -> Hash Left Join (cost=1.14..466.78 rows=7864 width=103)
> Hash Cond: ("outer".id_dostawcy = "inner".id_dostawcy)
> -> Seq Scan on towar (cost=0.00..347.68 rows=7864 width=103)
> Filter: policzalne
> -> Hash (cost=1.11..1.11 rows=11 width=4)
> -> Seq Scan on dostawcy (cost=0.00..1.11 rows=11 width=4)
> -> Hash (cost=1.06..1.06 rows=6 width=12)
> -> Seq Scan on jednostka_miary (cost=0.00..1.06 rows=6 width=12)
> SubPlan
> -> Aggregate (cost=2722.71..2722.72 rows=1 width=14)
> -> Nested Loop (cost=64.33..2722.28 rows=171 width=14)
> -> Hash Join (cost=64.33..602.79 rows=368 width=12)
> Hash Cond: ("outer".id_zlecenia = "inner".id_zlecenia)
> -> Seq Scan on zlecenia_elementy (cost=0.00..488.85 rows=9185 width=20)
> -> Hash (cost=63.98..63.98 rows=140 width=8)
> -> Bitmap Heap Scan on zlecenia (cost=6.50..63.98 rows=140 width=8)
> Recheck Cond: ((id_paczka = 52) OR (id_paczka = 50) OR (id_paczka = 53))
> -> BitmapOr (cost=6.50..6.50 rows=142 width=0)
> -> Bitmap Index Scan on zlecenia_id_paczka (cost=0.00..2.17 rows=47 width=0)
> Index Cond: (id_paczka = 52)
> -> Bitmap Index Scan on zlecenia_id_paczka (cost=0.00..2.17 rows=47 width=0)
> Index Cond: (id_paczka = 50)
> -> Bitmap Index Scan on zlecenia_id_paczka (cost=0.00..2.17 rows=47 width=0)
> Index Cond: (id_paczka = 53)
> -> Index Scan using zlezenia_towar_elementy_towar on zlecenia_towar (cost=0.00..5.75 rows=1 width=18)
> Index Cond: ((zlecenia_towar.id_zlecenia_elementy = "outer".id_zlecenia_elementy) AND (zlecenia_towar.id_towar = $0))
> (33 rows)
>
> --
> Best regards,
> Maciej mailto:piechcio@isb.com.pl
>
>
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To: pgsql-sql@postgresql.org
Cc: mbertheau.pg@googlemail.com, piechcio@isb.com.pl
Subject: Re: How to optimize this query?
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