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Give an example of a situation under which the performance of equality selection queries on attribute a can be greatly affected by how r is clustered. . Suppose you also had range selection queries on attribute b. Can you cluster r in such a way that the equality selection queries on r.a and the range selection queries on r.b can both be answered efficiently? Explain your answer.

Give an example of a situation under which the performance of equality selection queries on attribute a can be greatly affected by how r is clustered. . Suppose you also had range selection queries on attribute b. Can you cluster r in such a way that the equality selection queries on r.a and the range selection queries on r.b can both be answered efficiently? Explain your answer.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Suppose you are given a relation r(a, b, c). a. Give an example of a situation under which the performance of equality selection queries on attribute a can be greatly affected by how r is clustered. b. Suppose you also had range selection queries on attribute b. Can you cluster r in such a way that the equality selection queries on r.a and the range selection queries on r.b can both be answered efficiently? Explain your answer. c. If clustering as above is not possible, suggest how both types of queries can be executed efficiently by choosing appropriate indices.
Transcribed Image Text:Suppose you are given a relation r(a, b, c). a. Give an example of a situation under which the performance of equality selection queries on attribute a can be greatly affected by how r is clustered. b. Suppose you also had range selection queries on attribute b. Can you cluster r in such a way that the equality selection queries on r.a and the range selection queries on r.b can both be answered efficiently? Explain your answer. c. If clustering as above is not possible, suggest how both types of queries can be executed efficiently by choosing appropriate indices.
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