On Tue, Feb 27, 2018 at 2:58 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> "David G. Johnston" <david.g.johns...@gmail.com> writes: > > > Also, I recall discussion that select statements will touch the > visibility > > map (hence causing write I/O even in a read-only query) but [1] indicates > > that only vacuum will set them ddl will clear them. > > Hm, I don't recall that, but I've not been involved in the last few rounds > of hacking on that mechanism. > I was confusing hint bits with the visibility map, sorry for the noise and/or confusion. David J.
