Horton
Menu

Re: Removing pg_migrator limitations

Bruce Momjian <bruce@momjian.us>

View thread
From: Bruce Momjian <bruce@momjian.us>
To: Greg Stark <stark@mit.edu>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Greg Stark <gsstark@mit.edu>, Andrew Dunstan <andrew@dunslane.net>, PostgreSQL-development <pgsql-hackers@postgresql.org>, Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2009-12-27T20:13:23Z
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@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +