On 2012-11-19 10:46:37 -0800, Jeff Davis wrote:
> On Tue, 2012-11-20 at 00:13 +0530, Atri Sharma wrote:
>
> > My mistake...I thought we were more concerned about the cost of
> > locking.
> >
> > I agree, locking many data pages simultaneously could be hazardous.
> >
> > This requires more thought.Maybe removing PD_ALL_VISIBLE isnt such a
> > great idea after all...
>
> As I said elsewhere in the thread, I'm not planning to introduce any
> additional locking. There is already precedent in IndexOnlyNext.
Yea, but that precedent is only valid because IOS does check for a MVCC
snapshots. Also it doesn't set anything.
Greetings,
Andres Freund
-- Andres Freund http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
Services
