Object-oriented Database Management Systems

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They represent the degrees of freedom left to the system designers. An OODBMS should be a database management system and at the same time an object oriented system. The first characteristic is translated to the following features: persistence, concurrency, recovery, secondary storage management, and ad hoc query mechanisms...
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The second characteristic is translated to the following: composite objects, object-identity, encapsulation, inheritance overriding and late binding, extensibility, and computational completeness of the database language used. Composite objects can be built recursively from simpler ones by applying constructors to them...
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