Distributed Database Definition/Meaning:
A database in which the data is contained within a number
of separate subsystems, usually in different physical locations. If the
constituent subsystems are essentially similar, the system is said to be
homogeneous, otherwise it is said to be heterogeneous. Distributed database
systems may vary very considerably. At one extreme is the type where the
complete system was conceived, designed, and implemented as a single entity;
such systems exist within large commercial organizations and are usually
homogeneous. At the other extreme is the case where a number of existing
systems, originally
planned as isolated systems, continue in their normal operation but in addition
are loosely linked to provide a larger distributed system over the whole; in
this instance the system is often heterogeneous. Distributed database systems
are currently an active topic for database research and development, largely
because of the availability of national and international communication
facilities.
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