| 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 |
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| Lists: | pgsql-advocacy pgsql-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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