Simon Riggs wrote:
> I would add that both Heikki and Greg Stark have argued at length that
> the visibility map cannot be relied upon in production systems.
It cannot be relied on *in its current form*. There's a hole in crash
recovery where it can be left in an inconsistent state. That obviously
needs to be fixed before it is relied on for index-only-scans or similar
purposes, but it's not an insurmountable problem.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com