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From: Laurenz Albe <[email protected]>
To: Daniel Verite <[email protected]>
Cc: Ron Johnson <[email protected]>
Cc: [email protected]
Subject: Re: Choosing default collation/ctype
Date: Mon, 04 May 2026 22:45:16 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

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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