On Tue, Aug 12, 2014 at 10:30 AM, Andres Freund <and...@2ndquadrant.com> wrote: >> Still not safe. Checksum collisions do happen, especially in big data sets. > > If you use an appropriate algorithm for appropriate amounts of data > that's not a relevant concern. You can easily do different checksums for > every 1GB segment of data. If you do it right the likelihood of > conflicts doing that is so low it doesn't matter at all.
True, but if you use LSNs the likelihood is 0. Comparing the LSN is also most likely a heck of a lot faster than checksumming the entire page. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
