Message-ID: <4d64ba01-fb1e-47ea-8364-0eaf3efd4c0e@proxel.se>
Date: Fri, 6 Feb 2026 22:03:15 +0100
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Subject: Re: doc: add note that wal_level=logical doesn't set up logical
 replication in itself
To: Florents Tselai <florents.tselai@gmail.com>,
 pgsql-hackers <pgsql-hackers@lists.postgresql.org>
References: <CA+v5N42vKtY17653eBHFx+Cw06E2fSmPrXmX2qKYG23=4Ycd7A@mail.gmail.com>
From: Andreas Karlsson <andreas@proxel.se>
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On 2/6/26 4:36 PM, Florents Tselai wrote:
> Twice this week I've encountered users confusing wal_level=logical with 
> the actual setup of Logical Replication.
> Since users often land directly on the config.html page via search engines,
> they see the setting and assume enabling it is all that is required for 
> replication to work.
> I think adding a clarification note here will prevent this (not so 
> uncommon) misunderstanding.

With the automatic change of effective WAL level which will be added in 
PostgreSQL 19 I think that addition will just move the confusion to 
another thing. If we want this note I think we need to clarify that 
replica is enough since that can be automatically increased to logical 
when necessary.

Andreas