On Sun, 4 Mar 2018 07:49:46 -0800 Jeff Janes <jeff.ja...@gmail.com> wrote:
> I don't see how it could have caused the problem in the first place. In > your demonstration case, you had to turn off autovac in order to get it to > happen, and then when autovac is turned back on, it is all primed for an > autovac to launch, go through, touch almost all of the pages, and fix it > for you. How did your original table get into a state where this wouldn't > happen? One more way for this to happen, vacuum was including the dead tuples in the estimate in addition to the live tuples. This is a separate bug that tends to aggravate the one I'm trying to fix. See the thread re BUG #15005 at: https://www.postgresql.org/message-id/16db4468-edfa-830a-f921-39a50498e77e%402ndquadrant.com > It seems to me that VACUUM and ANALYZE somewhat disagree on what exactly > reltuples means. VACUUM seems to be thinking that > > reltuples = live + dead > > while ANALYZE apparently believes that > > reltuples = live There is a patch for this one from Tomas Vondra/Tom Lane that I hope it will land in the next set of releases. -dg -- David Gould da...@sonic.net If simplicity worked, the world would be overrun with insects.
