Re: removing PD_ALL_VISIBLE

* Josh Berkus (josh@agliodbs.com) wrote:
> On 05/31/2013 12:22 PM, Stephen Frost wrote:
> > Where I'm going with this whole thing is simply that I do worry a bit
> > about using a bitmap for freeze, or similar, information and not being
> > able to reconstruct that bitmap from the heap.  Perhaps that's overly
> > paranoid, but, well, we also write the same data out to disk in multiple
> > places multiple times- some might call that paranoid too. ;)
>
> On the other hand, we could combine Heikki's proposal (epoch numbers in
> the page header) together with using the visibility map for pages we
> don't need to vacuum freeze, and get vastly better behavior without
> increasing corruption risk that I can see.

That was actually my thinking as well..
Thanks,
    Stephen