Periodical I ASM

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  Question (1) is compulsory. 1. What is a data model? Discuss the Hierarchical and Network Database Models. Write the advantages and disadvantages of these models.[4 marks] 2. Discuss the roles and resonsibilities of the various users of D!M . [# marks] OR  Discuss the ma$or advantages and disadvantages of file organi%ation s&stems. [# marks] 3. Discuss any two  of the following 'odd(s 'ommandments of )D!M *+a,-he h&sical /ndeendence )ule +)ule 0,. +b,-he 1ogical Data /ndeendence )ule +)ule 2,.+c,No ubversion )ule +)ule 3,.[3.5 6  7 # marks]  888888888888888888888888888888888888888888888888888888888888888888888888888888
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