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Re: Core team statement on replication in PostgreSQL

From: Greg Smith <gsmith(at)gregsmith(dot)com>
To: Gurjeet Singh <singh(dot)gurjeet(at)gmail(dot)com>
Cc: "Andreas 'ads' Scherbaum" <adsmail(at)wars-nicht(dot)de>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Core team statement on replication in PostgreSQL
Date: 2008-05-30 22:11:20
Message-ID: Pine.GSO.4.64.0805301809050.9617@westnet.com (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-hackers
On Sat, 31 May 2008, Gurjeet Singh wrote:

>> Not if you use pg_clearxlogtail
>
> This means we need to modify pg_standby to not check for filesize when
> reading XLogs.

No, the idea is that you run the segments through pg_clearxlogtail | gzip, 
which then compresses lightly used segments massively because all the 
unused bytes are 0.  File comes out the same size at the other side, but 
you didn't ship a full 16MB if there was only a few KB used.

--
* Greg Smith gsmith(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD

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