From: Ken Hill <ken@scottshill.com>
To: Postgres Help <pgsql-sql@postgresql.org>
Subject: Slow update SQL
Date: Mon, 13 Feb 2006 17:48:45 -0800
Message-ID: <1139881725.3183.2.camel@localhost.localdomain> (raw)
I'm experiencing a very slow query. The table contains 611,564 rows of
data. I vaccumed the table:
VACUUM ANALYZE ncccr10;
SELECT count(*) FROM ncccr10;
count
--------
611564
(1 row)
When I try to analyze the query plan with:
EXPLAIN ANALYZE
UPDATE ncccr10
SET key = facilityno||'-'||
lastname||'-'||
sex||'-'||
ssno||'-'||
birthdate||'-'||
primarysit||'-'||
dxdate||'-'||
morphology3
WHERE date_part('year',dxdate) > '2000';
The query just never finishes (even 1 hour later). The colum key100 is
indexed, and I'm setting the value of this
column from other columns. Why is this so slow?
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To: pgsql-sql@postgresql.org
Cc: ken@scottshill.com
Subject: Re: Slow update SQL
In-Reply-To: <1139881725.3183.2.camel@localhost.localdomain>
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