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Re: Block-level CRC checks

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>
Cc: "Zdenek Kotala" <Zdenek(dot)Kotala(at)sun(dot)com>, "Alvaro Herrera" <alvherre(at)commandprompt(dot)com>, "Pg Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Block-level CRC checks
Date: 2008-10-30 15:14:34
Message-ID: 15056.1225379674@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
"Jonah H. Harris" <jonah(dot)harris(at)gmail(dot)com> writes:
> On Thu, Oct 30, 2008 at 10:33 AM, Zdenek Kotala <Zdenek(dot)Kotala(at)sun(dot)com> wrote:
>> Please, DO NOT MOVE position of page version in PageHeader structure! And
>> PG_PAGE_LAYOUT_VERSION should be bump to 5.

> Umm, any in-place upgrade should be capable of handling changes to the
> page header.

Well, yeah, but it has to be able to tell which version it's dealing
with.  I quite agree with Zdenek that keeping the version indicator
in a fixed location is appropriate.

			regards, tom lane

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