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From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Daniel Verite <daniel@manitou-mail.org>
Cc: Ron Johnson <ronljohnsonjr@gmail.com>
Cc: pgsql-general@lists.postgresql.org
Subject: Re: Choosing default collation/ctype
Date: Mon, 04 May 2026 22:45:16 +0200
Message-ID: <bdce746ad6052774fbc0de138e7c4fcc77886e77.camel@cybertec.at> (raw)
In-Reply-To: <627add7e-94df-49ca-aa12-ae3900b7945f@manitou-mail.org>
References: <627add7e-94df-49ca-aa12-ae3900b7945f@manitou-mail.org>

On Mon, 2026-05-04 at 21:34 +0200, Daniel Verite wrote:
> Laurenz Albe wrote:
> 
> > > Then choose UTF8.
> > 
> > Right!  And I recommend "C" for the collation.
> 
> Yet the "C" collation is unsuitable for handling character types
> beyond ASCII.
> For instance, it considers that accented letters are not letters,
> so upper('été') is 'éTé' instead of 'ÉTÉ', and 'é' ~ '\w' is false.
> 
> C.UTF-8 solves that, and since Postgres 17, it's available for all operating
> systems with the builtin provider.
> So if you target Postgres 17+, C.UTF-8 from the builtin provider is
> a better choice for UTF-8 databases than "C" .

Yes, "builtin" and the "C" collation is the best default value.

Yours,
Laurenz Albe

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