Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eZ0QO-0005GU-Ur for pgsql-general@arkaria.postgresql.org; Tue, 09 Jan 2018 20:23:09 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eZ0QN-0000Ls-RO for pgsql-general@arkaria.postgresql.org; Tue, 09 Jan 2018 20:23:07 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1eZ0QN-0000Lj-4n for pgsql-general@lists.postgresql.org; Tue, 09 Jan 2018 20:23:07 +0000 Received: from out3-smtp.messagingengine.com ([66.111.4.27]) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1eZ0QJ-00030D-RR for pgsql-general@lists.postgresql.org; Tue, 09 Jan 2018 20:23:06 +0000 Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id 8985C20CCF; Tue, 9 Jan 2018 15:23:00 -0500 (EST) Received: from frontend2 ([10.202.2.161]) by compute5.internal (MEProxy); Tue, 09 Jan 2018 15:23:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-sender :x-me-sender:x-sasl-enc; s=fm1; bh=V971Jv/KZLNB8qkB9llbpgJS9C+4V 92/Qzc5uT0urQA=; b=SZgJX+T7LVEgkn01uYKNl9VKAJc1cM7KCh9nUmCTKNpKr 93dILwdSF6g/e3f87z0tpTVkh1wdfulsN55oayyw4aKLHW6Q5u4sbGF42fZu8ui1 pYzBbo5M73tbYgomtfvpoZbE7oDUrDt24bKxw0NWXk7Qsa9/eTjVw2dxYqj3KNiV HlDsDQ2h2wZEPu9uap72aLxmIRVkRwSHhTlwJuLDGtptdsJxhRJqEpJi14aZ3CJ9 1X0SmEM1EaNYryOnoYfMrx4okNWyVBmb1JaO3PdsvH5GjXZq1dbhcqG1epQXs2JO solUINFiPiwb9jqhk1d/nHsRIF835h2hiiXa9aWyA== X-ME-Sender: Received: from intern.anarazel.de (unknown [136.24.76.189]) by mail.messagingengine.com (Postfix) with ESMTPA id 41E1A24235; Tue, 9 Jan 2018 15:23:00 -0500 (EST) Date: Tue, 9 Jan 2018 12:22:59 -0800 From: Andres Freund To: Rakesh Kumar Cc: Alvaro Herrera , Stephen Frost , "pgsql-general@lists.postgresql.org" Subject: Re: data-checksums Message-ID: <20180109202259.cpszfiavep42pp6v@alap3.anarazel.de> References: <20180109184149.ih4ore4c4axwizor@alvherre.pgsql> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk On 2018-01-09 20:04:04 +0100, Rakesh Kumar wrote: > > > > I also would like to believe that the hit is small, but when PG > > > official document writes "noticeable performance penalty", it becomes > > > difficult to convince management that the hit is small :-) > > > > Why believe, when you can measure? > > yup doing that. But I still feel that PG documentation should stay > away from such scare mongering. Or did the lawyers write that :) So we should rather lie about it having a potential for performance impact? Who'd be helped by that? Greetings, Andres Freund