From: Joost Kraaijeveld <J.Kraaijeveld@Askesis.nl>
To: Pgsql-Performance <pgsql-performance@postgresql.org>
Subject: Can this query go faster???
Date: Tue, 06 Dec 2005 10:43:49 +0100
Message-ID: <1133862229.8837.61.camel@Panoramix> (raw)
Hi,
Is it possible to get this query run faster than it does now, by adding
indexes, changing the query?
SELECT customers.objectid FROM prototype.customers, prototype.addresses
WHERE
customers.contactaddress = addresses.objectid
ORDER BY zipCode asc, housenumber asc
LIMIT 1 OFFSET 283745
Explain:
Limit (cost=90956.71..90956.71 rows=1 width=55)
-> Sort (cost=90247.34..91169.63 rows=368915 width=55)
Sort Key: addresses.zipcode, addresses.housenumber
-> Hash Join (cost=14598.44..56135.75 rows=368915 width=55)
Hash Cond: ("outer".contactaddress = "inner".objectid)
-> Seq Scan on customers (cost=0.00..31392.15
rows=368915 width=80)
-> Hash (cost=13675.15..13675.15 rows=369315 width=55)
-> Seq Scan on addresses (cost=0.00..13675.15
rows=369315 width=55)
The customers table has an index on contactaddress and objectid.
The addresses table has an index on zipcode+housenumber and objectid.
TIA
--
Groeten,
Joost Kraaijeveld
Askesis B.V.
Molukkenstraat 14
6524NB Nijmegen
tel: 024-3888063 / 06-51855277
fax: 024-3608416
e-mail: J.Kraaijeveld@Askesis.nl
web: www.askesis.nl
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To: pgsql-performance@postgresql.org
Cc: J.Kraaijeveld@Askesis.nl
Subject: Re: Can this query go faster???
In-Reply-To: <1133862229.8837.61.camel@Panoramix>
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