Re: Page Checksums + Double Writes

From: Florian Weimer <fweimer(at)bfk(dot)de>
To: David Fetter <david(at)fetter(dot)org>
Cc: PG Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Page Checksums + Double Writes
Date: 2011-12-22 08:42:57
Message-ID: 828vm5f14e.fsf@mid.bfk.de
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* David Fetter:

> The issue is that double writes needs a checksum to work by itself,
> and page checksums more broadly work better when there are double
> writes, obviating the need to have full_page_writes on.

How desirable is it to disable full_page_writes? Doesn't it cut down
recovery time significantly because it avoids read-modify-write cycles
with a cold cache?

--
Florian Weimer <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99

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