Database System Concepts
7th Edition
ISBN: 9789332901384
Author: Henry F. Korth & S. Sudarshan Abraham Silberschatz
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Expert Solution & Answer
Chapter 13, Problem 7PE
Explanation of Solution
a.
MRU is preferable to LRU:
- The MRU is preferable where the operation R1 ⋈ R2 is computed.
- The above is computed using nested loop processing strategy. In this strategy, each tuple in R2 must be compared to each block in R1...
Explanation of Solution
b.
LRU is preferable to LRU:
- The LRU is preferable to MRU where R1 ⋈ R2 is computed by sorting the relations by joining the values. Here comparing the values through the relation is also done for the sorting.
- It is needed to “back-up” in one of the relation if the duplicates occur...
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