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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Pavel Stehule <pavel.stehule@gmail.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: slow queries over information schema.tables
Date: Thu, 06 Dec 2018 11:32:42 -0500
Message-ID: <20577.1544113962@sss.pgh.pa.us> (raw)
In-Reply-To: <CA+TgmobB=Ky_GOa4-M3afJHup3LC9FoV-tLmU--XBdV+8Do-Tg@mail.gmail.com>
References: <CAFj8pRBUCX4LZ2rA2BbEkdD6NN59mgx+BLo1gO08Wod4RLtcTg@mail.gmail.com>
	<5978.1544030694@sss.pgh.pa.us>
	<20181205175657.s7mt6as356kwvrji@alap3.anarazel.de>
	<8210.1544034143@sss.pgh.pa.us>
	<20181205182555.x4wtnzffmhwsc3c7@alap3.anarazel.de>
	<8843.1544035292@sss.pgh.pa.us>
	<CA+TgmobB=Ky_GOa4-M3afJHup3LC9FoV-tLmU--XBdV+8Do-Tg@mail.gmail.com>

Robert Haas <robertmhaas@gmail.com> writes:
> I'm not thrilled about depending on sinval without locking,
> particularly given that my proposal to make sure we
> AcceptInvalidationMessages() at least once per query was shouted down.

It's fairly hard to imagine practical cases where we'd not call
AcceptInvalidationMessages at least once per query, so I'm not
very sure what you're on about.

			regards, tom lane




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