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help / color / mirror / Atom feedFrom: Andreas Karlsson <[email protected]>
To: Florents Tselai <[email protected]>
To: pgsql-hackers <[email protected]>
Subject: Re: doc: add note that wal_level=logical doesn't set up logical replication in itself
Date: Fri, 6 Feb 2026 22:03:15 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA+v5N42vKtY17653eBHFx+Cw06E2fSmPrXmX2qKYG23=4Ycd7A@mail.gmail.com>
References: <CA+v5N42vKtY17653eBHFx+Cw06E2fSmPrXmX2qKYG23=4Ycd7A@mail.gmail.com>
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
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Subject: Re: doc: add note that wal_level=logical doesn't set up logical replication in itself
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