Another Database solution: InterSystems Cache (Score 1)

Just to add another voice to the fray. :) You should talk to a sales engineer for Cache (http://www.intersys.com). It is all you say, performs about 80% (yes, eighty) better than Oracle in most circumstances, is massively scalable, and is so reliable that it's the leading database used in the healthcare industry. It's also very inexpensive compared to what you would be laying out for Oracle. Just a thought.