On Thu, Mar 24, 2022 at 9:59 AM Peter Geoghegan <pg@bowt.ie> wrote:
> On Wed, Mar 23, 2022 at 1:53 PM Robert Haas <robertmhaas@gmail.com> wrote:
> > And therefore I favor defining it to mean that we don't
> > skip any work at all.
>
> But even today DISABLE_PAGE_SKIPPING won't do pruning when we cannot
> acquire a cleanup lock on a page, unless it happens to have XIDs from
> before FreezeLimit (which is probably 50 million XIDs behind
> OldestXmin, the vacuum_freeze_min_age default). I don't see much
> difference.
Yeah, I found it confusing that DISABLE_PAGE_SKIPPING doesn't disable
all page skipping, so 3414099c turned out to be not enough.