At the kind of scale you're talking about, I am pretty confident that 90% of people just won't need to do anything on that scale. For most people, business logi

At the kind of scale you're talking about, I am pretty confident that 90% of people just won't need to do anything on that scale. For most people, business logic in the DB will serve their needs perfectly. And if some day they need to scale up to some level beyond a single DB, I'm also pretty confident that they'll have the resources to spend on a DBA consultant specialising in sharding or replication :-)