On Thu, Jul 29, 2021 at 02:28:55PM -0400, Bruce Momjian wrote:
> On Thu, Jul 29, 2021 at 10:00:12AM -0700, David G. Johnston wrote:
> > I'm warming up to "should" but maybe add a "why" such as "the old versions 
> > are
> > considered unsupported on the newer server".
> > 
> > I dislike "usually via operating system commands", just offload this to the
> > extension, i.e., "must be installed in the new cluster via installation
> > procedures specific to, and documented by, each extension (for contrib it is
> > usually enough to ensure the -contrib package was chosen to be installed 
> > along
> > with the -server package for your operating system.)"
> > 
> > I would simplify the first two sentences to just:
> > 
> > If the old cluster used extensions those same extensions must be installed 
> > in
> > the new cluster via installation procedures specific to, and documented by,
> > each extension.  For contrib extensions it is usually enough to install the
> > -contrib package via the same method you used to install the PostgreSQL 
> > server.

Oh, and you can't use the same installation procedures as when you
installed the extension because that probably included CREATE EXTENSION.
This really highlights why this is tricky to explain --- we need the
binaries, but not the SQL that goes with it.

-- 
  Bruce Momjian  <br...@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  If only the physical world exists, free will is an illusion.



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