Re: visibility maps

On Wed, Dec 17, 2008 at 7:11 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
>
> I think what you are suggesting is that we should set the visibility map
> bit while dead line pointers (tombstones) still remain.  If that's what
> you meant it's a bad idea.

No, I'm not suggesting that. I understand the problem there. I was
merely explaining how HOT-prune may some time (when there are no DEAD
line pointers created) help us set the visibility bit early.

OTOH I think we can still set PD_ALL_VISIBLE page header flag even
when there are DEAD line pointers.

Thanks,
Pavan

-- 
Pavan Deolasee
EnterpriseDB     http://www.enterprisedb.com