From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
---|---|
To: | Jeff Davis <pgsql(at)j-davis(dot)com> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Enabling Checksums |
Date: | 2012-12-03 13:18:52 |
Message-ID: | CA+U5nMKG_4xXWV7oui9sGj9QuAbxySwfDwkhbk7m6CxLJm3DCQ@mail.gmail.com |
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Lists: | pgsql-hackers |
On 26 November 2012 02:32, Jeff Davis <pgsql(at)j-davis(dot)com> wrote:
> * Make the checksum algorithm process 4 bytes at a time and sum into a
> signed 64-bit int, which is faster than byte-at-a-time. Also, forbid
> zero in either byte of the checksum, because that seems like a good
> idea.
Like that, especially the bit where we use the blocknumber as the seed
for the checksum, so it will detect transposed pages. That's also a
really neat way of encrypting the data for anybody that tries to
access things via direct anonymous file access.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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