On 26 November 2012 02:32, Jeff Davis <pgsql@j-davis.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