A a computer aided design system for a manufacturer

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a. A computer-aided design system for a manufacturer of airplanes. b. A system to track contributions made to candidates for public office. c. An information system to support the making of movies. Answer: a. A computer-aided design system for a manufacturer of airplanes: An OODB system would be suitable for this. That is because CAD requires complex data types, and being computation oriented, CAD tools are typically used in a programming language envi- ronment needing to access the database. b. A system to track contributions made to candidates for public office: A relational system would be apt for this, as data types are ex- pected to be simple, and a powerful querying mechanism is es- sential. c. An information system to support the making of movies: Here there will be extensive use of multimedia and other complex data types. But queries are probably simple, and thus an object relational system is suitable.
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6 Chapter 22 Object-Based Databases 22.6 How does the concept of an object in the object-oriented model differ from the concept of an entity in the entity-relationship model? Answer: An entity is simply a collection of variables or data items. An object is an encapsulation of data as well as the methods (code) to operate on the data. The data members of an object are directly visible only to its methods. The outside world can gain access to the object’s data only by passing pre-defined messages to it, and these messages are implemented by the methods.
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  • Spring '13
  • Dr.Khansari
  • Relational model, SQL schema definition, schema definition, Object-Based Databases

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