On Tue, Nov 7, 2017 at 2:40 PM, Юрий Соколов <funny.fal...@gmail.com> wrote: >> The same is true of unique indexes vs. non-unique. > > offtopic: recently I'd a look at setting LP_DEAD in indexes. > I didn't found huge difference between unique and non-unique indices. > There is codepath that works only for unique, but it is called less > frequently than common codepath that also sets LP_DEAD.
I meant to say that this is only important with UPDATEs + contention. The extra LP_DEAD setting within _bt_check_unique() makes quite a noticeable difference, at least in terms of index bloat (though less so in terms of raw TPS). -- Peter Geoghegan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
