> > > I don't think such a document already exists, even rtfm_please doesn't know
> > > about any as of now.
> > The reason there isn't one is it doesn't need one; it's an
> > implementation detail not a user-visible feature.
> One reason to think it needs to be explained is that it affects how you
> plan for VACUUM. In tables where HOT is in charge of a large part of
> cleanup, you need to do a lot less vacuuming than you were for 8.2. In
> that sense it is very much user-visible.
Wouldn't the thresholds in the auto-vaccuming make that adjustment
transparent?