Re: First draft of the PG 15 release notes

On Wed, May 11, 2022 at 02:19:20PM +0200, Matthias van de Meent wrote:
> On Tue, 10 May 2022 at 17:44, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> >
> > I have completed the first draft of the PG 15 release notes and you can
> > see the results here:
> >
> > https://momjian.us/pgsql_docs/release-15.html
> >
> > The feature count is similar to recent major releases:
> >
> > release-10 195
> > release-11 185
> > release-12 198
> > release-13 183
> > release-14 229
> > --> release-15 186
> >
> > I assume there will be major adjustments in the next few weeks based on
> > feedback.
>
> With 10a8d138 (an extension on the work of PG14's 3c3b8a4b, which was
> listed in the release notes for PG14) we now truncate the LP array in
> more cases, which means that overall a workload with mainly HOT
> updates might require VACUUM to run less often to keep the relation
> size stable.
>
> I will admit that I am tooting my own horn, but I think it is worth
> mentioning for DBAs, as it reduces the bloating behaviour of certain
> classes of bloat-generating workloads (and thus they might need to
> re-tune any vacuum-related settings).

We barely document HOT updates, and this change seems too marginal to
mention. I think we already have enough VACUUM changes that people will
need to reevaluate their vacuum settings anyway.

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

Indecision is a decision. Inaction is an action. Mark Batterson