pg.ddx.io pgsql-performance@postgresql.org mailing list archive help / color / mirror / Atom feed From: Jean-Pierre Pelletier <pelletier_32@sympatico.ca>
To: John Arbash Meinel <john@arbash-meinel.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Queries 15 times slower on 8.1 beta 2 than on 8.0
Date: Thu, 22 Sep 2005 18:28:29 -0400
Message-ID: <BAYC1-PASMTP02016A006E41387CB3337B95970@CEZ.ICE> (raw )
References: <BAYC1-PASMTP01EE67AD3A0034394D85D895970@CEZ.ICE >
<433326A6.8010708@arbash-meinel.com >
<BAYC1-PASMTP0276B50280C40ABC9BBCB495970@CEZ.ICE >
<43332A24.8000809@arbash-meinel.com >
With enable-seq-scan = off, it runs in 350 ms so better than 484 ms
but still much slower than 32 ms in 8.0.1.
==============================================
Table "public.content"
Column | Type | Modifiers
------------+---------+-----------
contentid | integer | not null
supplierid | integer |
priceid | integer |
Table "public.price"
Column | Type | Modifiers
-----------------------+--------------------------------+-----------
priceid | integer | not null
itemid | integer |
supplierid | integer |
locationid | smallint |
fromdate | date |
unitvalue | numeric |
insertedbypersonid | integer |
lastupdatedbypersonid | integer |
inserttimestamp | timestamp(0) without time zone |
lastupdatetimestamp | timestamp(0) without time zone |
Indexes:
"price_pkey" PRIMARY KEY, btree (priceid)
Table "public.supplier"
Column | Type |
Modifie
rs
---------------------+--------------------------------+-------------------------
---------------------
supplierid | integer | not null default
nextval
('SupplierId'::text)
supplierdescription | character varying(50) | not null
inserttimestamp | timestamp(0) without time zone | default now()
approvaldate | date |
Indexes:
"Supplier Id" PRIMARY KEY, btree (supplierid)
"Supplier Description" UNIQUE, btree (upper(supplierdescription::text))
"Supplier.InsertTimestamp" btree (inserttimestamp)
Check constraints:
"Supplier Name cannot be empty" CHECK (btrim(supplierdescription::text)
<> ''::tex
================================================================================
Explan analyze with enable-seq-scan = off on 8.1 beta2
QUERY PLAN
--------------------------------------------------------------------------------
------------------------------------------------------------
Merge Left Join (cost=100000005.60..101607964.74 rows=1 width=0) (actual
time=
729.067..729.078 rows=1 loops=1)
Merge Cond: ("outer".priceid = "inner".priceid)
-> Sort (cost=100000005.60..100000005.60 rows=1 width=4) (actual
time=0.064
..0.067 rows=1 loops=1)
Sort Key: c.priceid
-> Nested Loop Left Join (cost=100000000.00..100000005.59 rows=1
widt
h=4) (actual time=0.038..0.049 rows=1 loops=1)
-> Seq Scan on content c (cost=100000000.00..100000001.01
ro
ws=1 width=8) (actual time=0.008..0.011 rows=1 loops=1)
-> Index Scan using "Supplier Id" on supplier s
(cost=0.00..4.5
6 rows=1 width=4) (actual time=0.016..0.019 rows=1 loops=1)
Index Cond: ("outer".supplierid = s.supplierid)
-> Index Scan using "Price Id" on price p (cost=0.00..1606505.44
rows=58147
5 width=4) (actual time=0.008..370.854 rows=164842 loops=1)
Total runtime: 729.192 ms
----- Original Message -----
From: "John Arbash Meinel" <john@arbash-meinel.com>
To: "Jean-Pierre Pelletier" <pelletier_32@sympatico.ca >
Cc: <pgsql-performance@postgresql.org>
Sent: Thursday, September 22, 2005 6:03 PM
Subject: Re: [PERFORM] Queries 15 times slower on 8.1 beta 2 than on 8.0
view thread (21+ messages) latest in thread
Message-ID: <BAYC1-PASMTP02016A006E41387CB3337B95970@CEZ.ICE>
Permalink: ../BAYC1-PASMTP02016A006E41387CB3337B95970@CEZ.ICE/
Also on: postgresql.org/message-id/BAYC1-PASMTP02016A006E41387CB3337B95970@CEZ.ICE
copy link · copy postgr.es
reply Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: pelletier_32@sympatico.ca, john@arbash-meinel.com
Subject: Re: Queries 15 times slower on 8.1 beta 2 than on 8.0
In-Reply-To: <BAYC1-PASMTP02016A006E41387CB3337B95970@CEZ.ICE>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox