Re: [PATCH] Document wal_compression=on

John Naylor <johncnaylorls@gmail.com>

From: John Naylor <johncnaylorls@gmail.com>

To: wenhui qiu <qiuwenhuifx@gmail.com>

Cc: Michael Paquier <michael@paquier.xyz>, Christoph Berg <myon@debian.org>, PostgreSQL-development <pgsql-hackers@postgresql.org>

Date: 2026-06-30T09:48:53Z

Lists: pgsql-hackers

On Tue, Jun 30, 2026 at 4:27 PM wenhui qiu <qiuwenhuifx@gmail.com> wrote:

>> 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?

FYI, default value of wal_compression is "off".

--
John Naylor
Amazon Web Services

Commits

Document wal_compression=on
- 92b129945065 17 (unreleased) landed
- 17cc7f57a405 16 (unreleased) landed
- 225dd7ab4e6a 15 (unreleased) landed
- 6a6cf80e5508 18 (unreleased) landed
- b26e0f61451d 19 (unreleased) landed
- 8db58ac8eec7 master landed