Re: Compression of full-page-writes

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Compression of full-page-writes
Date: 2014-12-12 14:39:44
Message-ID: CA+TgmobPMGPS6dK4EgwJGuLmMp=Ct29KJ2Jv7MXepJ0f9DwXCw@mail.gmail.com
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On Fri, Dec 12, 2014 at 9:34 AM, Michael Paquier
<michael(dot)paquier(at)gmail(dot)com> wrote:
>> I don't think that's a cost worth caring about.
> OK, I thought it was.

Space on the heap that never gets used is basically free. The OS
won't actually allocate physical memory unless the pages are actually
accessed.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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