Re: How about a psql backslash command to show GUCs?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org>
Cc: Julien Rouhaud <rjuju123(at)gmail(dot)com>, Christoph Berg <myon(at)debian(dot)org>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Joe Conway <mail(at)joeconway(dot)com>, Mark Dilger <mark(dot)dilger(at)enterprisedb(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, David Rowley <dgrowleyml(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: How about a psql backslash command to show GUCs?
Date: 2022-04-12 17:00:41
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"Jonathan S. Katz" <jkatz(at)postgresql(dot)org> writes:
> On 4/12/22 11:19 AM, Tom Lane wrote:
>> It'd just look like this, I think. I see from looking at guc.c that
>> boot_val can be NULL, so we'd better use IS DISTINCT FROM.

> I tested it and I like this a lot better, at least it's much more
> consolidated. They all seem to be generated (directories, timezones,
> collations/encodings).

Yeah, most of what shows up in a minimally-configured installation is
postmaster-computed settings like config_file, rather than things
that were actually set by the DBA. Personally I'd rather hide the
ones that have source = 'override', but that didn't seem to be the

> The one exception to this seems to be "max_stack_depth", which is
> rendering on my "\dconfig" though I didn't change it, an it's showing
> it's default value of 2MB. "boot_val" says 100, "reset_val" says 2048,
> and it's commented out in my postgresql.conf. Do we want to align that?

I don't think there's any principled thing we could do about that in
psql. The boot_val is a conservatively small 100kB, but we crank
that up automatically based on getrlimit(RLIMIT_STACK), so on any
reasonable platform it's going to show as not being default.

regards, tom lane

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