On Mon, Mar 10, 2014 at 07:40:42PM +0100, Pavel Stehule wrote: > > > > > There were several bottlenecks in this area removed in 9.2 and 9.3. > > Unfortunately the worst of those bottlenecks were in the server, so they > depend > > on what database you are upgrading from, and so won't help you much > upgrading > > from 9.1. > > Yes, I assume 9.3 will be much better, though Jeff is right that if it > is pg_dump locking that is hurting you, you might not see a win even in > 9.3. > > > I'll see it next year when we plan to migrate to 9.4 > > I though so some form of "superlock" can be interesting, because nobody can > work with database when it is upgraded.
Remember pg_upgrade is using pg_dump, which then connecting to a backend, so passing that super-lock mode there is not ideal. The fixes in 9.3 improve locking in all user cases, not just upgrades.