On Tue, Mar 6, 2018 at 11:27 PM, Alvaro Herrera <alvhe...@alvh.no-ip.org> wrote: > Hello > > I haven't read your respective patches yet, but both these threads > brought to memory a patch I proposed a few years ago that I never > completed: > > https://www.postgresql.org/message-id/flat/20130124215715.GE4528%40alvh.no-ip.org
Thank you for sharing the thread. > > In that thread I posted a patch to implement a prioritisation scheme for > autovacuum, based on an equation which was still under discussion when > I abandoned it. Chris Browne proposed a crazy equation to mix in both > XID age and fraction of dead tuples; probably that idea is worth > studying further. I tried to implement that in my patch but I probably > didn't do it correctly (because, as I recall, it failed to work as > expected). Nowadays I think we would also consider the multixact freeze > age, too. > > Maybe that's worth giving a quick look in case some of the ideas there > are useful for the patches now being proposed. Yeah, that's definitely useful for the patches. I'll look at this and will discuss that here. Regards, -- Masahiko Sawada NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center
