This link might help: http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14210/hafeatures.htm#CJAFCCFJ I haven't done a rolling upgrade with RAC so I can't comment on that route, but I did do one with DG and it worked great. On Tue, Aug 31, 2010 at 11:21 AM, Upendra N <nupendra@xxxxxxxxxxx> wrote: > We have a 2 node Oracle RAC on 10.2.0.3, would like to upgrade 10.2.0.4. > Due to application SLA, I'm exploring the possibilities with no or least > downtime for the upgrade. > > We'll have the 10.2.0.4 binaries installed ahead of time on both the boxes > to reduce the window. > > Assuming we could potentially get another 2-node RAC cluster, what are the > choices we could use to avoid downtime? > > I can think of a couple of scenarios: > 1. Oracle Streams setup to replicate both-ways and/or similar to > Multi-master replication > 2. We could do something similar with Golden gate - may be more expensive.. > > Not sure if this will work: > 1. Data guard with switchover > > Any other suggestions on reducing the upgrade window are appreciated. > Thank you > -Upendra > > >