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 22, Problem 16E
Explanation of Solution
a)
Attribute that are candidate for partitioning:
- In parallel systems, the data gets partitioned over different disks. The partitions are performed based on the attribute present in the relation.
- Consider a relation with specified work load of SQL queries. The candidate attribute for the partitioning would be
- The one which has maximum queries that holds selection condition. The condition is then evaluated using a single processor rather than performing all of them...
Explanation of Solution
b)
Choose between the alternative:
- To choose between the alternative partitioning techniques the cost based approach would be the best approach.
- Generate various candidates partitioning choice for each candidate too.
- The cost of estimating all the queries including the updates in the given workload.
- Choose the candidate that will lead to least cost.
- The problem is that usually both the number of candidate attributes and queries can be too large...
Explanation of Solution
c)
Partitioning a relation:
Yes, it is possible to partition a relation on more than one attribute in the following ways;
- Involving the attributes in a single compound partitioning key...
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