"David G. Johnston" <david.g.johns...@gmail.com> writes:
> ​Admittedly, I'm not sure how you would fix any problems without access to
> the server and its config files - at which point you are back to simply
> reviewing those.

Yeah.  Other related problems include being unable to *find* the log file
if you don't know what the server configuration is.

There is already a "postgres -C guc_name" option if you want to find out
from the command line what value a particular GUC is set to by the
cluster's configuration files.  I could see some value in a variant of
that that prints all GUCs with non-default sources.  But that would go
to stdout in any case.  Wanting it to go into a log file sounds to me
a whole lot like wanting to duplicate some Oracle-based DBA habits at a
bug-compatible level.

(Note also that there's already logging of on-the-fly *changes* in
configuration file settings, so I'm not buying the "historical info"
angle at all.)

                        regards, tom lane


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