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QUESTION
(a)(i) Define the term database.
(ii) How is it different from a database management system?
(b) What is the difference between an entity and an attribute?
(c) What is the difference between a data definition language (DDL) and a data manipulation language (DML)?
(d) Compare and contrast using diagrams between a hierarchical database model and a network models
(e) Give one advantage and one disadvantage of a hierarchical database model.
Explain trivial dependency? Functional dependency of the form α ->β. is trivial if α C β. Trivial functional dependencies are satisfied by all the relations.
The figure below depicts the conceptual diagram of a banking system. (a) Describe one example relevant to the system in figure, for each of the 4 types of enterprise appl
What was the method in which records are physically stored in a specified order according to a key field in each record ? A method in which records are physically stored within
Define tuple variable? Tuple variables are used for comparing two tuples in the same relation. The tuple variables are explained in the from clause by way of the as clause.
Explain pipelining. Ans: In order to describe pipelining in simple terms, think of it as breaking down processor functions into smaller and smaller parts. For instance,
What is the meaning of Recovery? In deferred update methods, if a transaction fails before arriving its commit point, it will not have altered the database in any way, so UNDO
Aggregation Aggregation is stronger form of association. It represents the "has-a" or "part-of" relationship. An aggregation association depicts a complex object which is comp
Define Physical and Logical independence Ans: Physical data independence: The ability to modify physical level without causing application program to be rewritten. Logic
The users who use easy-to-use menu are called ? The users who use easy to use menu are called as Naïve users.
What are the types of reference?explain it with suitable examples? Object oriented language given the ability to refer the object attribute of the type can be referred to the s
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