Re: Freeze avoidance of very large table.

On Sat, Oct 3, 2015 at 3:41 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Fri, Oct 2, 2015 at 11:23 AM, Alvaro Herrera
> <alvherre(at)2ndquadrant(dot)com> wrote:
>>> + /* all-frozen information is also cleared at the same time */
>>> PageClearAllVisible(page);
>>> + PageClearAllFrozen(page);
>>
>> I wonder if it makes sense to have a macro to clear both in unison,
>> which seems a very common pattern.
>
> I think PageClearAllVisible should clear both, and there should be no
> other macro. There is no event that causes a page to cease being
> all-visible that does not also cause it to cease being all-frozen.
> You might think that deleting or locking a tuple would fall into that
> category - but nope, XMAX needs to be cleared or the tuple pruned, or
> there will be problems after wraparound.
>

Thank you for your advice.
I understood.

I changed the patch so that PageClearAllVisible clear both bits, and
removed ClearAllFrozen.
Attached the latest v16 patch which contains draft version documentation patch.

Regards,

--
Masahiko Sawada