August
1999 QUESTION 2 Total Marks: 20 Marks |
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| (a) | Describe the DBMS architecture known as the three-schema
architecture. Your answer should include descriptions of each level of
architecture (3 marks for each level), as well as a diagram. (3 marks).
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[12] |
| (b) | (i) What is data independence? (ii) In the three-schema architecture, define the two forms of data independence, and explain which parts of the architecture make these two forms possible.
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[6] |