Re: Wal_keep_size

If wal_keep_size is more than max_wal_size wouldn't it always trigger checkpoint ?

On Tue, 7 Oct 2025, 03:08 Thomas Carroll, <tomfecarroll@yahoo.com> wrote:

Hope nobody minds me chipping in here.

The answer is "not necessarily."  The names make them seem closely related, but not so much.

max_wal_size is all about checkpoints.  When the WAL exceeds this, Postgres will try to run a checkpoint.  Under some circumstances it won't, but let's keep it simple for now.

wal_keep_size is all about replication.  Replicas need WAL files to stick around for long enough that they can process them.  wal_keep_size is a minimum figure.

Tom

On Monday, October 6, 2025 at 03:51:17 PM EDT, Raj <rajeshkumar.dba09@gmail.com> wrote:

Should Wal_keep_size <= max_wal_size ?