Re: 64-bit XIDs in deleted nbtree pages

On Fri, Feb 19, 2021 at 3:12 PM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
>
> On Thu, Feb 18, 2021 at 3:13 AM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
> > Agreed. Thanks for your explanation.
>
> Attached is v5, which has some of the changes I talked about. Changes
> from v4 include:
>
> * Now only updates metapage during btvacuumcleanup() in the first
> patch, which is enough to fix the existing
> IndexVacuumInfo.num_heap_tuples issue.
>
> * Restored _bt_getbuf() page-from-FSM XID check. Out of sheer paranoia.
>
> * The second patch in the series now respects work_mem when sizing the
> BTPendingRecycle array.
>
> * New enhancement to the XID GlobalVisCheckRemovableFullXid() test
> used in the second patch, to allow it to recycle even more pages.
> (Still unsure of some of the details here.)

Thank you for updating the patch!

>
> I would like to commit the first patch in a few days -- I refer to the
> big patch that makes deleted page XIDs 64-bit/full. Can you take a
> look at that one, Masahiko? That would be helpful. I can produce a bug
> fix for the IndexVacuumInfo.num_heap_tuples issue fairly easily, but I
> think that that should be written after the first patch is finalized
> and committed.

I'll look at the first patch first.

>
> The second patch (the new recycling optimization) will require more
> work and testing.

Then also look at those patches.

Regards,

--
Masahiko Sawada
EDB: https://www.enterprisedb.com/