From: Jim Nasby <Jim.Nasby@BlueTreble.com>
To: Joshua D. Drake <jd@commandprompt.com>
To: Warner, Gary, Jr <gar@uab.edu>
To: postgres performance list <pgsql-performance@postgresql.org>
Subject: Re: Big Memory Boxes and pgtune
Date: Wed, 2 Nov 2016 18:46:47 -0500
Message-ID: <bf50d943-d1a3-e87d-a91d-376434481b22@BlueTreble.com> (raw)
In-Reply-To: <44137c5c-2117-f497-7355-12ae06c1b299@commandprompt.com>
References: <0cfccbc24b9e480a9452bf9ca79e96e4@UABEX4.ad.uab.edu>
<44137c5c-2117-f497-7355-12ae06c1b299@commandprompt.com>
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On 10/28/16 2:33 PM, Joshua D. Drake wrote:
> * A very high shared_buffers (in newer releases, it is not uncommon to
> have many, many GB of)
Keep in mind that you might get very poor results if shared_buffers is
large, but not large enough to fit the entire database. In that case
buffer replacement will be *extremely* expensive. Some operations will
use a different buffer replacement strategy, so you might be OK if some
of the database doesn't fit in shared buffers; that will depend a lot on
your access patterns.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
855-TREBLE2 (855-873-2532) mobile: 512-569-9461
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To: pgsql-performance@postgresql.org
Cc: Jim.Nasby@BlueTreble.com, jd@commandprompt.com, gar@uab.edu
Subject: Re: Big Memory Boxes and pgtune
In-Reply-To: <bf50d943-d1a3-e87d-a91d-376434481b22@BlueTreble.com>
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