Bruce Momjian wrote: > On Thu, Feb 23, 2017 at 03:03:39PM -0300, Alvaro Herrera wrote: > > Bruce Momjian wrote: > > > > > As I remember, WARM only allows > > > a single index-column change in the chain. Why are you seeing such a > > > large performance improvement? I would have thought it would be that > > > high if we allowed an unlimited number of index changes in the chain. > > > > The second update in a chain creates another non-warm-updated tuple, so > > the third update can be a warm update again, and so on. > > Right, before this patch they would be two independent HOT chains.
No, they would be a regular update chain, not HOT updates. -- Álvaro Herrera https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
