Re: pg_migrator issues

Tom Lane wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
> > On Tue, Jan 5, 2010 at 11:06 AM, Alvaro Herrera
> > <alvherre@commandprompt.com> wrote:
> >> Tom Lane wrote:
> >>> Good point. Using catversion for the purpose seems a bit ugly but
> >>> I have no better ideas.
> >> 
> >> I thought we had rejected the idea of being able to migrate between
> >> alphas. Is migrating between major versions not difficult enough?
> 
> > We like a challenge.
> 
> The problem with using just major version there is that then we are
> *wiring into the on-disk representation* the assumption that pg_migrator
> only goes from one major version to the next.  I agree that we're not
> likely to start supporting cross-alpha-version migration any time soon,
> but I don't think it's wise to foreclose the possibility of ever doing
> it.

I know people are trying to make things easier on pg_migrator, but
frankly going from alpha to alpha does not require any new code in
pg_migrator.  And pg_migrator already supports cross-alpha-version
migration just using the existing code --- no new code was added to
enable this.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

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