pgsql: Document wal_compression=on

From: John Naylor <john(dot)naylor(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Document wal_compression=on
Date: 2026-07-01 02:17:02
Message-ID: E1wekVa-000qkg-11@gemulon.postgresql.org
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Document wal_compression=on

Commit 4035cd5d4 added LZ4 compression for full-page writes in WAL, and
retained "on" as a backward-compatible way to specify the builtin PGLZ
method. Document this meaning of "on" and update postgresql.conf.sample
to make the equivalence clear.

Author: Christoph Berg <myon(at)debian(dot)org>
Reviewed-by: Michael Paquier <michael(at)paquier(dot)xyz>
Discussion: https://postgr.es/m/akJDHRtXwGLTppsQ@msg.df7cb.de
Backpatch-through: 15

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/17cc7f57a405417c72189b27e073a1f71faab372

Modified Files
--------------
doc/src/sgml/config.sgml | 1 +
src/backend/utils/misc/postgresql.conf.sample | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)

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