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From: PG Doc comments form <noreply@postgresql.org>
To: pgsql-docs@lists.postgresql.org
Cc: o15611@gmail.com
Subject: parameter log_connections can not be changed at session start
Date: Sat, 01 Mar 2025 15:25:24 +0000
Message-ID: <174084272409.674.11017551444105641709@wrigleys.postgresql.org> (raw)

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/17/bug-reporting.html
Description:

Parameter: log_connections.
"Only superusers and users with the appropriate SET privilege can change
this parameter at session start, and it cannot be changed at all within a
session."
Parameter can not be changed at session start. May be it "may" be changed,
but without an any effect.
Testcase:
export PGOPTIONS="-c log_connections=on -c work_mem=5MB"
psql -h 127.0.0.1 -c "show work_mem;"
Then check the log, for example:
tail $PGDATA/log/postgresql-*

The same time, the similar parameter log_disconnections can be changed at
the session start as correctly descibed in documentation. This can be easily
checked by:
export PGOPTIONS="-c log_disconnections=on"


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