Re: AdvanceXLInsertBuffer vs. WAL segment compressibility

From: Chapman Flack <chap(at)anastigmatix(dot)net>
To: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
Cc: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: AdvanceXLInsertBuffer vs. WAL segment compressibility
Date: 2016-07-26 03:32:59
Message-ID: 5796D9EB.6070407@anastigmatix.net
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On 07/25/16 22:09, Michael Paquier wrote:

> This is over-complicating things for little gain. The new behavior of
> filling in with zeros the tail of a segment makes things far better
> when using gzip in archive_command.

Then how about filling with actual zeros, instead of with mostly-zeros
as is currently done? That would work just as well for gzip, and would
not sacrifice the ability to do 100x better than gzip.

-Chap

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