From: | "Nathan Barnett" <nbarnett(at)cellularphones(dot)com> |
---|---|
To: | <pgsql-general(at)postgresql(dot)org> |
Subject: | Memory Usage |
Date: | 2000-12-08 16:03:18 |
Message-ID: | 71975481CD04D4118E57004033A2596E0DFB81@ip205.82.136.216.in-addr.arpa |
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Thread: | |
Lists: | pgsql-general |
I am having a small issue with PostgreSQL 7.0.3 on FreeBSD 4.2 Stable. When
I perform an update on a table with roughly 2 million rows, the postgres
process starts eating up memory until it eventually uses up all of the
memory and exits without finishing. I have also seen the same thing happen
in complex SELECT statements that I have run. The update statement is as
follows:
UPDATE pages SET createdtime = NOW();
Is there a reason why this would take up all of the memory?? Also the
select statement that caused the issue was a SELECT and GROUP BY that was in
the form of:
SELECT COUNT(*) AS hitcount, date_part('yy', createdtime) AS Year,
date_part('mm', createdtime) AS Month, date_part('dd', createdtime) AS Day
FROM Log group by Year, Month, Day
I found a better way to do this afterwards, but why wouldn't the database
utilize temporary tables to complete this query without using all the RAM?
---------------------------------------------
Nathan Barnett
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