Re: heap metapages

On Tue, May 22, 2012 at 09:52:30AM +0100, Simon Riggs wrote:
> Having pg_upgrade touch data files is both dangerous and difficult to
> back out in case of mistake, so I am wary of putting the metapage at
> block 0. Doing it the way I suggest means the .meta files would be
> wholly new and can be deleted as a back-out. We can also clean away
> any unnecessary .vm/.fsm files as a later step.

Pg_upgrade never modifies the old cluster, except to lock it in link
mode, so there is never anything to back out.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + It's impossible for everything to be true. +