Re: Names of encodings, lc_collate, lc_ctype

Holger Jakobs <holger(at)jakobs(dot)com> writes:
> CREATE DATABASE db1 WITH TEMPLATE = template0 ENCODING = 'UTF8'
> LC_COLLATE = 'en_US.UTF-8' LC_CTYPE = 'en_US.UTF-8';
> which causes trouble on a PostgreSQL 10 or 11 on an Ubuntu 18.04 machine
> ungültiger Locale-Name: »en_US.UTF-8« (meaning 'illegal locale name')

Hmm, does "locale -a" show that you have en_US installed?

It's basically on the platform's libc to say whether the values for
LC_COLLATE and LC_CTYPE are valid. In my experience, glibc is quite
forgiving about how the encoding suffix is spelled, so I'm wondering
if your destination machine is simply lacking the locale definition.

> The command
> select * from pg_collation;
> shows (among many others of course)
> en_US.utf8

This doesn't have anything to do with what CREATE DATABASE accepts,
IIRC. It does show that when initdb ran, it saw en_US.utf8 reported
by "locale -a"; but maybe that was in a different environment.

> How come there are encodings/collations/locales with and without hyphen?
> Why does the Ubuntu machine not accept a locale which is present in
> lc_collation?

Interesting questions, but you need a glibc expert not a Postgres
expert.

regards, tom lane