Re: Block-level CRC checks

Andrew Dunstan wrote:
> 
> 
> Tom Lane wrote:
> > Robert Haas <robertmhaas@gmail.com> writes:
> >   
> >> OK, fair enough.  My implication that only page formats were at issue
> >> was off-base.  My underlying point was that I think we have to be
> >> prepared to write code that can understand old binary formats (on the
> >> tuple, page, or relation level) if we want this to work and work
> >> reliably.  I believe that there has been much resistance to that idea.
> >>     
> >
> > We keep looking for cheaper alternatives.  There may not be any...
> >
> >             
> >   
> 
> Yeah. I think we might need to bite the bullet on that and start 
> thinking more about different strategies for handling page versioning to 
> satisfy various needs. I've been convinced for a while that some sort of 
> versioning scheme is inevitable, but I do understand the reluctance.

I always felt our final solution would be a combination of pg_migrator
for system catalog changes and page format conversion for page changes.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + If your life is a hard drive, Christ can be your backup. +