Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 15, Problem 5PE
Explanation of Solution
Lowest-cost way to compute r and s relations:
- The relation “r” is called the outer relation and “s” is called the inner relation of the join, since the loop for “r” encloses the loop for “s”.
- The user can store the whole smaller relation in memory, read the larger relation block by block and perform nested loop join using the larger one as the outer relation.
- The nested loop join
algorithm is expensive, since it examines every pair of tuples in the two relations...
Explanation of Solution
Amount of memory required for this algorithm:
- The number of I/ O (Input/ Output) operations is equal to “br + bs”, and memory requirement is “min (br + bs) + 2” pages...
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