Re: Core team statement on replication in PostgreSQL

["Gurjeet Singh" <singh(dot)gurjeet(at)gmail(dot)com>]

On Sat, May 31, 2008 at 3:41 AM, Greg Smith <gsmith(at)gregsmith(dot)com> wrote:

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.

Got it. I remember reading about pg_clearxlogtail in these mailing lists; but somehow forgot how it actually worked!

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