NoSQL database(a NoSQL database provides a mechanism for storage and retrieval of data which is modeled in means other than the tabular relations used in relational databases 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)