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Consider an information system designed for an online company which provides IT products and services. These include desktops, laptops, networking products, IT books, parts, and te
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Define average latency time. The average latency time of the disk is one-half the time for a full rotation of the disk.
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
How do you find the final model after iterative analysis? Why is iterative analysis of any of the problem needed? The final model serves as the base for system architectur
The Concurrent Transactions Almost every commercial DBMS support multi-user environment. Therefore, allowing multiple transactions to proceed concurrently. The DBMS must make
What's the difference between a primary key and a unique key? Both primary key and unique key enforces uniqueness of the column on which they are explained. But by default prim
What is disadvantage of multiple inheritances? There is potential ambiguity if the similar variable or method can be inherited from more than one superclass.eg: student class m
Difference between Operating System and Database Security Security within the operating system can be executed at various levels ranging from passwords for access to system, t
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
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