Horton

Re: [PATCH] Document wal_compression=on

wenhui qiu <qiuwenhuifx@gmail.com>

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From: wenhui qiu <qiuwenhuifx@gmail.com>
To: Michael Paquier <michael@paquier.xyz>
Cc: John Naylor <johncnaylorls@gmail.com>, Christoph Berg <myon@debian.org>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2026-06-30T09:27:40Z
Lists: pgsql-hackers 
> Hi
>
> The recent PostgreSQL commit changes the default TOAST compression to lz4 when
> LZ4 support is available, based on the rationale that LZ4 is generally more
> efficient than pglz in terms of CPU usage and compression ratio.Given
> that, should we also consider changing the default compression method used
> by wal_compression = on from pglz to lz4?
>
Currently, wal_compression = on still maps to pglz, while lz4 has to be
> selected explicitly with:
>
> wal_compression = lz4
>
> If LZ4 is now considered stable and preferable enough to become the
> default for TOAST compression, it may be worth aligning WAL compression
> behavior as well, or at least discussing whether on should continue to
> imply pglz.
>



Thanks

Commits

  1. Document wal_compression=on