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 22, Problem 13E
a.
Explanation of Solution
Difference operation
- First, the relations on all the attributes in the tuples are partitioned.
- Next at each individual processor, the difference is computed...
b.
Explanation of Solution
Aggregation by count operation
- Here the count is implemented just like the sum operation.
- The only difference is that during partitioning, the count of number of values ...
c.
Explanation of Solution
Aggregation by the count distinct operation
- Here partial counts cannot be computed locally before partitioning.
- Each processor will transfer all uniqu...
d.
Explanation of Solution
Aggregation using the avg operation
- This operation can be performed like the sum operation.
- During partitioning, sum the values of attribute as well as count the number of tuples in the group...
e.
Explanation of Solution
Left outer join
- Here left outer join is parallelized if the join condition involves only equality...
f.
Explanation of Solution
Left outer join
- Here left outer join is parallelized if the join condition entails condition other than equality.
- Here all tuples from relation r which does not match any tuples from relation s is collected...
g.
Explanation of Solution
Full outer join
- Here full outer join is parallelized if the join condition involves comparisons other than equality.
- Here the procedure is same as that of left oute...
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a
a
a
b
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1
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