On Fri, May 11, 2018 at 12:04 PM, Andres Freund <and...@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
