On Apr18, 2013, at 19:04 , Jeff Davis <pg...@j-davis.com> wrote: > On Wed, 2013-04-17 at 20:21 -0400, Greg Smith wrote: >> -Original checksum feature used Fletcher checksums. Its main problems, >> to quote wikipedia, include that it "cannot distinguish between blocks >> of all 0 bits and blocks of all 1 bits". > > That is fairly easy to fix by using a different modulus: 251 vs 255.
At the expense of a drastic performance hit though, no? Modulus operations aren't exactly cheap. best regards, Florian Pflug -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
