From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: 16-bit page checksums for 9.2 |
Date: | 2012-02-05 03:59:03 |
Message-ID: | 20120205035903.GC1307@momjian.us |
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Lists: | pgsql-hackers |
On Sat, Dec 24, 2011 at 03:56:58PM +0000, Simon Riggs wrote:
> > Also, as far as I can see this patch usurps the page version field,
> > which I find unacceptably short-sighted. Do you really think this is
> > the last page layout change we'll ever make?
>
> No, I don't. I hope and expect the next page layout change to
> reintroduce such a field.
>
> But since we're agreed now that upgrading is important, changing page
> format isn't likely to be happening until we get an online upgrade
> process. So future changes are much less likely. If they do happen, we
> have some flag bits spare that can be used to indicate later versions.
> It's not the prettiest thing in the world, but it's a small ugliness
> in return for an important feature. If there was a way without that, I
> would have chosen it.
Have you considered the CRC might match a valuid page version number?
Is that safe?
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ It's impossible for everything to be true. +
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