Re: PG 14 release notes, first draft

On Mon, May 10, 2021 at 08:08:01AM -0700, Peter Geoghegan wrote:
> On Mon, May 10, 2021 at 7:00 AM Justin Pryzby <pryzby(at)telsasoft(dot)com> wrote:
> > | Allow VACUUM VERBOSE to report page deletion counts for each scan of an index (Peter Geoghegan)
> >
> > I think "Allow" is wrong - should just say that VACUUM VERBOSE reports..
>
> It's also not accurate, since the count of deleted pages was always
> shown by VACUUM VERBOSE (once per index scan). The new feature has us
> show pages deleted by the VACUUM that actually ran (not some earlier
> VACUUM) -- these are "newly deleted pages".
>
> I don't think that this item is worth mentioning, though -- it's just
> a nice to have. If Bruce removes it from the release notes entirely I
> won't object.

OK, removed. Additional debug output usually isn't important
mentioning --- when you need it, you will see it.

> In addition to the items that I commented on in my response to
> Matthias just now, I should point out the following item as worthy of
> inclusion:
>
> 9dd963ae25 Recycle nbtree pages deleted during same VACUUM.
>
> I suggest that this item be phrased more or less as follows:
>
> "Allow VACUUM to eagerly place newly deleted B-Tree pages in the Free
> Space Map. Previously VACUUM could only place preexisting deleted
> pages in the Free Space Map for recycling."

So, previously it could only place pages that were deleted from the
previous vacuum on the free list?

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

If only the physical world exists, free will is an illusion.