On Wed, Sep 19, 2018 at 12:14:57AM +0000, Tsunakawa, Takayuki wrote:
> From: Masahiko Sawada [mailto:sawada.m...@gmail.com]
> > I didn't follow the first sentence of the above hunk. Is the
> > wal_sender_timeout relevant with %q?
> 
> Ouch, that's a careless mistake.  I copied the paragraph from another
> parameter and failed to remove some sentence.  Patch revised.

-        A value of zero disables the timeout mechanism.  This parameter
-        can only be set in
-        the <filename>postgresql.conf</filename> file or on the server
-        command line.
+        A value of zero disables the timeout mechanism.
+        Only superusers can change this parameter at session start,
+        and it cannot be changed at all within a session.
         The default value is 60 seconds.

Parameters classified as PGC_BACKEND can be updated by any users, and
those marked as PGC_SU_BACKEND can only be updated by superusers.
Replication users are not superusers, which is why PGC_BACKEND is most
adapted.  Your description should just say "This parameter cannot be
changed after session start.
--
Michael

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