bq. My understanding is that whatever database AWS supports it will let you scale up as much as required If by "as much as required" you mean "to larger single

bq. My understanding is that whatever database AWS supports it will let you scale up as much as required If by "as much as required" you mean "to larger single EC2 instances," yes. If you mean backing it with a SAN or transparently partitioning your data across multiple instance, no. http://aws.amazon.com/rds/faqs/#22 http://aws.amazon.com/rds/faqs/#22