Re: Avoid full page images in streaming replication?

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Jim Nasby <Jim(dot)Nasby(at)BlueTreble(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 22:53:27
Message-ID: 20151022225327.GU3391@alvherre.pgsql
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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

--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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