Re: pgsql: doc: mention dependency on collation libraries

On Sat, Jul  2, 2016 at 05:39:51PM +0200, Christoph Berg wrote:
> Re: Bruce Momjian 2016-07-02 <E1bJMkm-0001gS-3c@gemulon.postgresql.org>
> > doc: mention dependency on collation libraries
> >
> > Document that index storage is dependent on the operating system's
> > collation library ordering, and any change in that ordering can create
> > invalid indexes.
>
> Shouldn't this mention that OS upgrades are a possible problem as
> well? We've seen the de_DE.UTF-8 ordering break in RHEL 5->6, and
> again in 6->7. (5 and 7 are compatible.) The problematic strings were
> "999" and "9-9-9".
>
> (German writeup:
> http://www.credativ.de/blog/postgresql-und-inkompatible-deutsche-spracheigenschaften-centosrhel)

Yes, we can do that.  Do you have suggested wording?  I was not sure how
to tell people anything related to collation versions.

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

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