Distributed Databases (DDB):
A distributed database is a collection of several, logically interrelated database located at multiple locations of a computer network. A distributed database management system permits the management of such a database and makes the operation transparent to the user. Good examples of distributed databases would be those utilized by banks, multinational firms with several office locations where each distributed data system works only with the data that is relevant to it’s operations. DDBs have have full functionality of any DBMS. It’s also important to know that the distributed databases are considered to be actually one database rather than discrete files and data within distributed databases are logically interrelated.