Robert Haas wrote:
> On Fri, Jan 28, 2011 at 9:50 PM, Bruce Momjian <bruce@momjian.us> wrote:
> >> Major releases usually change the format of system tables. ?These
> >> changes are often complex, so we do not maintain backward
> >> compatibility. ?Our dump and reload tools do maintain backward
> >> compatibility and are the most reliable way to perform a major version
> >> upgrade. ?Some major releases also change the internal format of data
> >> files; however, in recent releases, we have made an attempt to
> >> minimize such changes. ?In cases where the data file formats have not
> >> changed, pg_upgrade can also be used for major upgrade version
> >> upgrades; this is typically much faster than a dump and reload.
> >
> > That seems quite detailed for the web site. ?If we want that I think we
> > should add those details to the pg_upgrade manual page. ?Some of that is
> > already there.
>
> It's not that much more than you wrote, and it has the redeeming value
> of being accurate...
I added five words.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ It's impossible for everything to be true. +