From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
cc: Stephen Frost <sfrost@snowman.net>, Amit Kapila <amit.kapila16@gmail.com>,
        Ian Barwick <ian.barwick@2ndquadrant.com>,
        Robert Haas <robertmhaas@gmail.com>,
        Tomas Vondra <tomas.vondra@2ndquadrant.com>,
        "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Subject: Re: [PATCH] Stop ALTER SYSTEM from making bad assumptions
In-reply-to: <1123.1564787124@sss.pgh.pa.us>
References: 
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 <20190624185647.GW2480@tamriel.snowman.net> <15032.1561403529@sss.pgh.pa.us>
 <20190624192014.GB2480@tamriel.snowman.net>
 <56aff4f3-dec8-f462-7feb-0938411b04a6@2ndquadrant.com>
 <CAA4eK1+JMm=tvx720y6jhD8pdzt=HdS1-TwQwkARib2pwK8EvQ@mail.gmail.com>
 <20190802222254.qsvqjtkwte464lu3@development>
 <31697.1564784856@sss.pgh.pa.us>
 <CAOuzzgqNyQM_z0biEEBVBK9WcaLmbCyWrd5xTdf-Oxb_9pntLA@mail.gmail.com>
 <32681.1564786027@sss.pgh.pa.us>
 <20190802225640.gm7bhwkgctzje4su@alap3.anarazel.de>
 <1123.1564787124@sss.pgh.pa.us>
Comments: In-reply-to Tom Lane <tgl@sss.pgh.pa.us>
	message dated "Fri, 02 Aug 2019 19:05:24 -0400"
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Date: Fri, 02 Aug 2019 19:09:49 -0400
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I wrote:
> Andres Freund <andres@anarazel.de> writes:
>> I think a commandline tool to perform the equivalent of ALTER SYSTEM on
>> a shutdown cluster would be a great tool.

> Perhaps, but ...

>> Obviously this is widely out of scope for v12.

> ... this.

Although, there's always

echo "alter system set work_mem = 4242;" | postgres --single

Maybe we could recommend that to tools that need to do
potentially-repetitive modifications?

			regards, tom lane