Date: Thu, 8 Jan 2026 23:42:43 +0100
From: "Peter 'PMc' Much" <pmc@citylink.dinoex.sub.org>
To: Rihad <grihad@gmail.com>
Cc: Daniel Verite <daniel@manitou-mail.org>,
        pgsql-general General <pgsql-general@postgresql.org>
Subject: Re: Collation again here
Message-ID: <aWAy44zgYdV8s0nB@cora.intra.daemon.contact>
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On Thu, Jan 08, 2026 at 05:26:47PM +0400, Rihad wrote:

! > As a general rule, you should indeed run the same OS version
! > for the primary and physical replicas.
! > Before Postgres version 15 this message did not exist, so the risks
! > of mismatch were silent but they existed just the same.
! > 
! > 
! > Best regards,
! 
! Thanks. Both FreeBSD 13.5 & 14.3 are "current", just from different major
! branches. I wonder why they use such different locale/collate versioning,
! meaning that they differ roughly by that much as in 34 vs. 43. Maybe someone
! there mistyped 34?)

Hi, I ran into that same (surprizing) error when upgrading FreeBSD
13.x to 14.x.

In FreeBSD the major version switches are for exactly that purpose: to
change interfaces or libaries that may induce incompatibilities

The version numbers (34.0 vs 43.0) might mean anything, I don't
know; but they originate from these places in the OS distribution:

$ hd /usr/share/locale/en_US.UTF-8/LC_COLLATE | head -1
00000000  42 53 44 20 31 2e 30 0a  00 00 00 00 34 33 2e 30  |BSD 1.0.....43.0|

In Yor case, apparently the conclusion is that you need the same
FreeBSD major version throughout Your replication set.

-- PMc