Re: Postgres 11 release notes

On Fri, May 11, 2018 at 12:04 PM, Andres Freund <andres@anarazel.de> wrote:
> I don't think the table being 'append-only' is necessary?  Nor does it
> have to be a manual vacuum. And 'needless index scan' sounds less than
> it is/was, namely a full scan of the index. Perhaps something like:
>
>   Allow vacuum to skip doing a full scan of btree indexes after VACUUM,
>   if not necessary.
>
> or something like that?

I suggest "Allow vacuuming to avoid full index scans for indexes when
there are no dead tuples found in a table. Where necessary, the
behavior can be adjusted via the new configuration parameter
vacuum_cleanup_index_scale_factor."

Also:

* "Allow indexes to be built in parallel" should specify that it only
works for B-Tree index builds.

* Suggest replacement sort item be phrased as: "Remove the
configuration parameter replacement_sort_tuples. <newline> The
replacement selection sort algorithm is no longer used."

-- 
Peter Geoghegan