On Fri, 2011-03-18 at 17:47 +0200, Heikki Linnakangas wrote: > On 18.03.2011 16:52, Kevin Grittner wrote: > > Simon Riggs<si...@2ndquadrant.com> wrote: > > > >> In PostgreSQL other users cannot observe the commit until an > >> acknowledgement has been received. > > > > Really? I hadn't picked up on that. That makes for a lot of > > complication on crash-and-recovery of a master, but if we can pull > > it off, that's really cool. If we do that and MySQL doesn't, we > > definitely don't want to use the same terminology they do, which > > would imply the same behavior. > > To be clear: other users cannot observe the commit until standby > acknowledges it - unless the master crashes while waiting for the > acknowledgment. If that happens, the commit will be visible to everyone > after recovery.
No, only in the case where you choose not to failover to the standby when you crash, which would be a fairly strange choice after the effort to set up the standby. In a correctly configured and operated cluster what I say above is fully correct and needs no addendum. -- Simon Riggs http://www.2ndQuadrant.com/books/ PostgreSQL Development, 24x7 Support, Training and Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
