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Define object-relational systems?
Systems that give object-oriented extensions to relational systems are known as object-relational systems.
What are the disadvantages of relational approach? Disadvantages of relational approach: • Substantial hardware and system software overhead • May not fit all business models •
Give the two reasons for allowing concurrency
Differentiate between Procedural and non procedural languages ? Procedural and non procedural languages - A procedural language specifies the operations to be performed on th
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
Determine the rule that a value of a foreign key should appear as a value of some particular table is called a Ans: Referential constraint. The rule that a value of a fo
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
why older data models are being replaced by new data models.
A practice called Perfect Pets provides private health care for domestic pets throughout America. This service is provided through various clinics located in the main cities of Ame
A distributed database is defined as "a collection of multiple logically interrelated database which are physically distributed over a computer network" (a) Give any three advan
Explain the Dynamic Hashing Techniques There are two methods in it: extendible hashing - stores an access structure in addition to the file, and therefore is somewhat identica
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