| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Greg Stark <stark(at)mit(dot)edu> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Greg Stark <gsstark(at)mit(dot)edu>, Andrew Dunstan <andrew(at)dunslane(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Subject: | Re: Removing pg_migrator limitations |
| Date: | 2009-12-27 20:13:23 |
| Message-ID: | 200912272013.nBRKDNI01040@momjian.us |
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| Thread: | |
| Lists: | pgsql-hackers |
Greg Stark wrote:
> I'm kind of curious about the heap page conversion plan. I think
> we have a plan for how to do page checksums now if someone
> submits it now will we have time to do the page wok to handle
> page conversions? Or if not, are we better off waiting till 8.6
> to get checksums?
Well, I think the checksums are going in the item pointers, so there
isn't any new storage space --- my guess is that the page version number
will control how the backend stores the checksum. Basically the backend
will need to read old and new page versions. I don't think this is
something pg_migrator can handle cleanly.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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