From: Tom Lane <tgl@sss.pgh.pa.us>
To: Bruce Momjian <bruce@momjian.us>
Cc: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>
Cc: tsunakawa.takay@jp.fujitsu.com
Cc: GavinFlower@archidevsys.co.nz
Cc: robertmhaas@gmail.com
Cc: ideriha.takeshi@jp.fujitsu.com
Cc: pgsql-hackers@lists.postgresql.org
Cc: alvherre@alvh.no-ip.org
Cc: andres@anarazel.de
Cc: michael.paquier@gmail.com
Cc: david@pgmasters.net
Cc: Jim.Nasby@bluetreble.com
Cc: craig@2ndquadrant.com
Subject: Re: Protect syscache from bloating with negative cache entries
Date: Thu, 24 Jan 2019 09:59:52 -0500
Message-ID: <16829.1548341992@sss.pgh.pa.us> (raw)
In-Reply-To: <20190124144732.GD8334@momjian.us>
References: <20190121.172255.226467552.horiguchi.kyotaro@lab.ntt.co.jp>
<20190123.173502.237450969.horiguchi.kyotaro@lab.ntt.co.jp>
<20190123232145.GA8334@momjian.us>
<20190124.183924.13894464.horiguchi.kyotaro@lab.ntt.co.jp>
<20190124144732.GD8334@momjian.us>
Bruce Momjian <bruce@momjian.us> writes:
> On Thu, Jan 24, 2019 at 06:39:24PM +0900, Kyotaro HORIGUCHI wrote:
>> I also thought that there's some other features that is useful if
>> it could be turned on remotely so the remote GUC feature but it
>> was too complex...
> Well, I am thinking if we want to do something like this, we should do
> it for all GUCs, not just for this one, so I suggest we not do this now
> either.
I will argue hard that we should not do it at all, ever.
There is already a mechanism for broadcasting global GUC changes:
apply them to postgresql.conf (or use ALTER SYSTEM) and SIGHUP.
I do not think we need something that can remotely change a GUC's
value in just one session. The potential for bugs, misuse, and
just plain confusion is enormous, and the advantage seems minimal.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, bruce@momjian.us, horiguchi.kyotaro@lab.ntt.co.jp, tsunakawa.takay@jp.fujitsu.com, GavinFlower@archidevsys.co.nz, robertmhaas@gmail.com, ideriha.takeshi@jp.fujitsu.com, pgsql-hackers@lists.postgresql.org, alvherre@alvh.no-ip.org, andres@anarazel.de, michael.paquier@gmail.com, david@pgmasters.net, Jim.Nasby@bluetreble.com, craig@2ndquadrant.com
Subject: Re: Protect syscache from bloating with negative cache entries
In-Reply-To: <16829.1548341992@sss.pgh.pa.us>
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