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Explain the term - Adjustment of inheritance
The inheritance can be enlarged as object design progresses by changing class structure. The designer should do:
i) Adjust or rearrange classes and operations
ii) Abstract common behavior out of groups of the classes
iii) Use delegation to share the behaviour when inheritance is semantically wrong.
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growing phase and shrinking phase are disjoint, why ?
Define check point and its impact on data base recovery. Ans: There could be hundreds of transactions handled per minute, in a large on-line database system.
Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design
About Attribute inheritance
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Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
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