Distributed database: a collection of multiple, logically interrelated databases distributed over a computer network.
Distributed DBMS: software that permits the management of the DDBS and makes the distribution transparent to the user.
To form a DDBS, files should be logically interrelated with a structure and access should be via a common interface.
By physically distributed we mean that the computers communicate via a network. A DDBS is not a system where the database resides on only one node of a network.
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