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Database Systems: Concepts, Design and Applications by S. K. Singh

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Review Questions

1.Describe the three-tier ANSI-SPARC architecture. Why do we need mappings between different schema levels? How do different schema definition languages support this architecture?
2.Discuss the advantages and characteristics of the three-tier architecture.
3.Discuss the concept of data independence and explain its importance in a database environment.
4.What is logical data independence and why is it important?
5.What is the difference between physical data independence and logical data independence?
6.How does the ANSI-SPARC three-tier architecture address the issue of data independence?
7.Explain the difference between external, conceptual and internal schemas. How are these different schema layers related to the concepts ...

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