EBK DATABASE SYSTEM CONCEPTS
7th Edition
ISBN: 9781260049268
Author: SILBERSCHATZ
Publisher: MCG COURSE
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Expert Solution & Answer
Chapter 15, Problem 1PE
Explanation of Solution
Creation of runs on each pass of the sort-merge
- The user will refer to the tuples (kangaroo, 17) through (baboon,12) using the tuple numbers “t1” through “t2”.
- The user refers to the jth run used by the ith pass as rij.
- The initial sorted runs have three blocks each. They are:
r11 = {t3, t1, t2}
r12 = {t6, t5, t4}
r13 = {t9, t7, t8}
r14 = {t12, t11, t10}
Here, each pass merges three runs.
Therefore, the runs after the end of the 1st pass are:
r21 = {t3, t1, t6, t9, t5, t2, t7, t4, t8}
r22 = {t12, t11, t10}
At the end of the 2nd pass, the tuples are completely sorted into one run:
r31 = {t12, t3, t11, t10, t1, t6, t9, t5, t2, t7, t4, t8}
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Chapter 15 Solutions
EBK DATABASE SYSTEM CONCEPTS
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