nServer-based DB: In a distributed DB, each node has a copy of the DBMS and dictionary. In server DB, applications must know where data is located; does not support location transparency.Appropriate for higher-performance transaction processing.
nFederated databases: Existing DB defined independently and retain rules for others to access its data.Works when incompatible DB
(text, alphanumeric, and image) are needed
in a single application.