Re: proposal: schema variables

From: Nico Williams <nico(at)cryptonector(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: proposal: schema variables
Date: 2017-11-02 18:52:39
Message-ID: 20171102185237.GQ4496@localhost
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On Thu, Nov 02, 2017 at 11:48:44AM -0400, Tom Lane wrote:
> Nico Williams <nico(at)cryptonector(dot)com> writes:
> > With access controls, GUCs could become schema variables, and settings
> > from postgresql.conf could move into the database itself (which I think
> > would be nice).
> People re-propose some variant of that every so often, but it never works,
> because it ignores the fact that some of the GUCs' values are needed
> before you can access system catalogs at all, or in places where relying
> on system catalog access would be a bad idea.

ISTM that it should be possible to break the chicken-egg issue by having
the config variables stored in such a way that knowing only the pgdata
directory path should suffice to find them. That's effectively the case
already in that postgresql.conf is found... there.

One could do probably this as a PoC entirely as a SQL-coded VIEW that
reads and writes (via the adminpack module's pg_catalog.pg_file_write())
postgresql.conf (without preserving comments, or with some rules
regarding comments so that they are effectively attached to params).


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