Orthogonal to this thread, but:
On Tue, Apr 30, 2013 at 06:39:09PM -0400, Greg Smith wrote:
> The WAL logging of hint bits is where the scary stuff to me for this
> feature has always been at. My gut feel is that doing that needed to
> start being available as an option anyway. Just this month we've had
> two customer issues pop up where we had to look for block differences
> between a master and a standby. The security update forced some normal
> update stragglers to where they now have the 9.1.6 index corruption fix,
> and we're looking for cases where standby indexes might have been
> corrupted by it. In this case the comparisons can just avoid anything
> but indexes, so hint bits are thankfully not involved.
B-tree indexes have hints; see callers of ItemIdMarkDead().
--
Noah Misch
EnterpriseDB http://www.enterprisedb.com
