From: | Shaun Thomas <sthomas(at)peak6(dot)com> |
---|---|
To: | Greg Spiegelberg <gspiegelberg(at)gmail(dot)com> |
Cc: | "Reuven M(dot) Lerner" <reuven(at)lerner(dot)co(dot)il>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Marcin Mańk <marcin(dot)mank(at)gmail(dot)com>, <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: Very long deletion time on a 200 GB database |
Date: | 2012-02-23 18:05:01 |
Message-ID: | 4F467FCD.8090100@peak6.com |
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Lists: | pgsql-performance |
On 02/23/2012 11:56 AM, Greg Spiegelberg wrote:
> I know there are perils in using ctid but with the LOCK it should be
> safe. This transaction took perhaps 30 minutes and removed 100k rows
> and once the table was VACUUM'd afterward it freed up close to 20 GB
> on the file system.
It took *30 minutes* to delete 100k rows? And 100k rows were using 20GB?
Is that off by an order of magnitude?
Using the ctid is a cute trick, though. :)
--
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
312-444-8534
sthomas(at)peak6(dot)com
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