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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