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Re: [REVIEW] Re: Compression of full-page-writes - Mailing list pgsql-hackers

From Simon Riggs
Subject Re: [REVIEW] Re: Compression of full-page-writes
Date
Msg-id CA+U5nMJ-F=pK6Cs9=LkV3u9ap-f6ej8Fq7Euh2XU7s+2wHxTjg@mail.gmail.com
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In response to Re: [REVIEW] Re: Compression of full-page-writes  (Michael Paquier <michael.paquier@gmail.com>)
Responses Re: [REVIEW] Re: Compression of full-page-writes
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On 13 December 2014 at 14:36, Michael Paquier <michael.paquier@gmail.com> wrote:

> Something to be aware of btw is that this patch introduces an
> additional 8 bytes per block image in WAL as it contains additional
> information to control the compression. In this case this is the
> uint16 compress_len present in XLogRecordBlockImageHeader.

So we add 8 bytes to all FPWs, or only for compressed FPWs?

-- Simon Riggs                   http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services

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