| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Rahila Syed <rahilasyed90(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [REVIEW] Re: Compression of full-page-writes |
| Date: | 2014-12-13 20:45:22 |
| Message-ID: | CA+U5nMJ-F=pK6Cs9=LkV3u9ap-f6ej8Fq7Euh2XU7s+2wHxTjg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 13 December 2014 at 14:36, Michael Paquier <michael(dot)paquier(at)gmail(dot)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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