modern relational database management systems(seek to provide the same scalable performance of NoSQL systems for online transaction processing (OLTP) read-write workloads while still maintaining the ACID guarantees of a traditional database system Alex_Odeychuk)
federated database system(A federated database system is a type of database management system, which transparently maps multiple autonomous database systems into a single federated database. The constituent databases are interconnected via a computer network and may be geographically decentralized. osp.ruAlex_Odeychuk)