A distributed database (DDB) is an integrated collection of databases that is physically distributed across sites in a computer network. A distributed database management system (DDBMS) is the software system that manages a distributed database such that the distribution aspects are transparent to the users. To form a distributed database system (DDBS), the files must be structured, logically interrelated, and physically distributed across multiple sites. In addition, there must be a common interface to access the distributed data.
Pls go to ref read more
https://web.stanford.edu/dept/itss/docs/oracle/10gR2/server.102/b14231/ds_concepts.htm#i1007534

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