On 25.12.2011 15:01, Kevin Grittner wrote:
I don't believe that. Double-writing is a technique to avoid torn pages, but it requires a checksum to work. This chicken-and-egg problem requires the checksum to be implemented first.
I don't think double-writes require checksums on the data pages themselves, just on the copies in the double-write buffers. In the double-write buffer, you'll need some extra information per-page anyway, like a relfilenode and block number that indicates which page it is in the buffer.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
