Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eYyo6-0000Kt-El for pgsql-general@arkaria.postgresql.org; Tue, 09 Jan 2018 18:39:30 +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 1eYyo6-0004cy-2D for pgsql-general@arkaria.postgresql.org; Tue, 09 Jan 2018 18:39:30 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1eYyo5-0004cp-Nr for pgsql-general@lists.postgresql.org; Tue, 09 Jan 2018 18:39:29 +0000 Received: from out3-smtp.messagingengine.com ([66.111.4.27]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1eYyo2-0003dN-VR for pgsql-general@lists.postgresql.org; Tue, 09 Jan 2018 18:39:28 +0000 Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id 8E1E820BA9; Tue, 9 Jan 2018 13:39:25 -0500 (EST) Received: from frontend1 ([10.202.2.160]) by compute5.internal (MEProxy); Tue, 09 Jan 2018 13:39:25 -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=Z3z7yghE5IDTTK3G26nL4zz7A6FqG zZXN/NHCpiho+0=; b=JFQYgMK+u6xDTkYFVRLo4EW7t5k8PxQHx5wlpLLVRyXny Y/KFPQh9/F3KBrY3l8QiR4i7siQ08jk+togRHw0eJ2k+KaI3IkHds32w+900lvTw dgmW4HXX2KsR0y0jMMv9QljL5RbWvUULZAMxInBKNhlLQFNSPI42VvXLD35VBDPl TX5tPuH5uZpZ2zXaGvqzAUcO5Lx1T9v5YvTJWEFgQ0nhPzqa+I8PbQBTahXXu8RT t8xKT688eyuY5G9nD6AVHqloBqj+6wapv4Ju8mOaTrICGLPqKVkNP1Htu9unHBrF qVdyjKs38+7o/yw6KP8SIV+onpIYJI6eGqp2zMwmw== X-ME-Sender: Received: from intern.anarazel.de (unknown [136.24.76.189]) by mail.messagingengine.com (Postfix) with ESMTPA id 401A97E351; Tue, 9 Jan 2018 13:39:25 -0500 (EST) Date: Tue, 9 Jan 2018 10:39:24 -0800 From: Andres Freund To: Rakesh Kumar Cc: Stephen Frost , "pgsql-general@lists.postgresql.org" Subject: Re: data-checksums Message-ID: <20180109183924.gmqo4ltdj7oxltla@alap3.anarazel.de> References: <20180109175410.GH2416@tamriel.snowman.net> 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 18:58:41 +0100, Rakesh Kumar wrote: > > > That said, imv anyway, the performance hit is small and having checksums > > is well worth it. > > 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 :-) noticeable != huge. - Andres