Bryan, I know you're quoting, it's probably not completely *your* opinion. I guess I missed an important announcement. When did Oracle start to support 'full rolling upgrades'? AFAIK, that's pretty much non-existent Best regards, Carel-Jan Engel === If you think education is expensive, try ignorance. (Derek Bok) === On Tue, 2005-12-13 at 12:43 -0600, Bryan Thomas wrote: > Here is a quote from an internal Oracle Metalink article: > > <SNIP> > RAC and Data Guard combined does provide more comprehensive protections not > covered by RAC on Extended Distance Clusters alone. This includes protection > against corruptions, users errors (in 9i), protection against regional > disasters, and support for full rolling upgrades across Oracle versions.