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Re: Overhauling GUCS

From: "Stephen R(dot) van den Berg" <srb(at)cuci(dot)nl>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Overhauling GUCS
Date: 2008-06-02 15:07:15
Message-ID: 20080602150715.GA4217@cuci.nl (view raw or flat)
Thread:
Lists: pgsql-hackers
Tom Lane wrote:
>Greg Smith <gsmith(at)gregsmith(dot)com> writes:
>> Joshua has been banging a drum for a while now that all this data needs to 
>> get pushing into the database itself.

>This is, very simply, not going to happen.  Shall we go over the reasons
>why not, one more time?

>1. Quite a few of the GUC parameters are needed *before* one can ever
>read the database; in particular the ones about file locations and
>shared memory sizing.

Obviously.

>2. Suppose you change a parameter in a way that breaks the DB (eg,
>set shared_buffers to a value larger than your kernel allows) and
>try to restart.  Database doesn't start.  If the parameter can only
>be changed back within an operating database, you're hosed.

That's why those parameters will always have to be read from a textfile.
Which doesn't prohibit that textfile to be generated from within the
database (once up and running).  And yes, if someone changes the
parameter through the DB, then makes the DB write out the configfile,
then restarts the DB remotely, and the change didn't work out (i.e. DB
doesn't start, or crashes/hangs), he is hosed and needs to log in and change
the textfile with a texteditor, no way around it.

>I have no objection to providing alternative ways to edit the
>configuration data, but the primary source of the settings is
>going to continue to be an editable text file.  Any proposals for
>alternatives-to-a-text-editor have to work within that reality.

I think everyone is aware of that.
-- 
Sincerely,
           Stephen R. van den Berg.

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