Database System Concepts
7th Edition
ISBN: 9789332901384
Author: Henry F. Korth & S. Sudarshan Abraham Silberschatz
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 14, Problem 1PE
Explanation of Solution
Indices and its purpose:
- Indices provide link to data with a specific value.
- Indices also used to make the search faster.
- Indices should not be created on every searchable attribute because of the following reasons:
- Firstly, an index takes extra storage space in memory.
- Index also includes additional overhead in terms of both CPU time and disk I/O at the time of insertion and deletion of records.
- When it comes to updates, there is no need to update the index if it is not present on a primary key, but if the index is present on a non-primary key, it has to be changed with every update.
- If the queries contain conditions for many search keys, use the indices on few of the keys which is sufficient to offer better efficiency.
- Lastly, if there are too many indices in the
database , the improvement performance is not much.
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