Heikki Linnakangas <heikki.linnakan...@enterprisedb.com> writes: > (As also discussed in the Royal Oak) I think we should simply not dirty > a page when a hint bit is updated. Reading a page from disk is > expensive, setting hint bits on the access is generally cheap compared > to that. But that is orthogonal to the idea of a per-page XID epoch.
I'm not sure it's cheap. What you suggest would result in a substantial increase in clog accesses, which means (1) more I/O and (2) more contention. Certainly it's worth experimenting with, but it's no guaranteed win. regards, tom lane -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers