Database design fundamentally trades off the speed of acknowledging writes with durability/availability (these are the same thing at scale) guarantees. If you n

Database design fundamentally trades off the speed of acknowledging writes with durability/availability (these are the same thing at scale) guarantees. If you need to guarantee that a change has been replicated globally then you cannot acknowledge the write as quickly as if you have a single control server with no need for persistence. "Scalable"? Needs more context please. Scalable how? And what are you willing to compromise on for that scale?