Re: Avoid full page images in streaming replication?

From: Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>
To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Avoid full page images in streaming replication?
Date: 2015-10-22 23:21:06
Message-ID: 56296F62.6030603@BlueTreble.com
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On 10/22/15 5:53 PM, Alvaro Herrera wrote:
> Jim Nasby wrote:
>
>> But yes, this is all very hand-wavy without any actual data on what
>> percentage of the WAL stream is FPIs. Looks like pageinspect doesn't work
>> for WAL... does anyone have a script/tool that breaks out what percentage of
>> a WAL file is FPIs?
>
> pg_xlogdump -z

Hrm, any option for 9.4? I was hoping to get numbers from some real
workloads...
--
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

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