On Tue, Oct 7, 2008 at 4:45 PM, Yavor Ivanov <Yavor_Ivanov@xxxxxxxx> wrote: > Hello, Dan > Yes, I see I did not explain myself to clearly... I haven't done 10g > -> 11g RAC upgrades, but as far as I remember, 9i to 10g RAC upgrade > requires downtime for the whole cluster during the upgrade > ...not necessarily...you can install 10g cluster and run it parallel to 9i cluster, then migrate your single instance or rac databases to 10g with (or without) db downtime... goran