Modern Database Management (12th Edition)
12th Edition
ISBN: 9780133544619
Author: Jeffrey A. Hoffer, Ramesh Venkataraman, Heikki Topi
Publisher: PEARSON
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Chapter 5, Problem 5.24RQ
Explain why an index is useful only if there is sufficient variety in the values of an attribute.
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Explain why an index is only helpful if the values of an attribute are sufficiently varied.
Explain why an index is only useful if the values of an attribute are sufficiently varied.
Explain why an index is only helpful if an attribute's values are sufficiently diverse.
Chapter 5 Solutions
Modern Database Management (12th Edition)
Ch. 5 - Prob. 5.1RQCh. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - Prob. 5.4RQCh. 5 - Prob. 5.5RQCh. 5 - Prob. 5.6RQCh. 5 - Prob. 5.7RQCh. 5 - Prob. 5.8RQCh. 5 - Explain why you sometimes have to reserve much...Ch. 5 - Why are field values sometimes coded?
Ch. 5 - Prob. 5.11RQCh. 5 - Prob. 5.12RQCh. 5 - Explain why normalized relations may not comprise...Ch. 5 - Prob. 5.14RQCh. 5 - List three common situations that suggest that...Ch. 5 - Explain the reasons why some experts are against...Ch. 5 - Prob. 5.17RQCh. 5 - Prob. 5.18RQCh. 5 - Prob. 5.19RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - State nine rules of thumb for choosing indexes.Ch. 5 - One of the strongest recommendations regarding...Ch. 5 - Explain why an index is useful only if there is...Ch. 5 - Indexing can clearly be very beneficial. Why...Ch. 5 - Consider the following two relations for...Ch. 5 - Prob. 5.28PAECh. 5 - Prob. 5.29PAECh. 5 - Prob. 5.30PAECh. 5 - Prob. 5.31PAECh. 5 - Suppose you are designing a default value for the...Ch. 5 - When a student has not chosen a major at a...Ch. 5 - Prob. 5.34PAECh. 5 - Prob. 5.35PAECh. 5 - Consider the relations in Problem and Exercise...Ch. 5 - Prob. 5.37PAECh. 5 - Prob. 5.38PAECh. 5 - Prob. 5.39PAECh. 5 - Prob. 5.40PAECh. 5 - Prob. 5.41PAECh. 5 - Consider the relations specified in Problem and...Ch. 5 - Prob. 5.43PAECh. 5 - Prob. 5.44PAECh. 5 - Prob. 5.45PAECh. 5 - Prob. 5.46PAECh. 5 - Prob. 5.47PAECh. 5 - Problems and Exercises 8-65 through 8-68 refer to...Ch. 5 - Refer to the large Pine Valley Furniture Company...Ch. 5 - Problems and Exercises 8-65i5 through 8-68 refer...Ch. 5 - Refer to Figure 4-5 0. For each of the following...
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- In the hierarchy of data, what is the difference between a data attribute and a data item? What is the domain of an attribute?arrow_forwardExplain why an index is only useful if the values of an attribute are different enough.arrow_forwardExplain why an index is only helpful if the values of an attribute have a suitable range of values.arrow_forward
- Explain why an index is only useful if the values of an attribute vary sufficiently.arrow_forwardExplain why an index is useful only if there is sufficient variety in the values of an attribute?arrow_forwardGive an example of why an index is only helpful if the attribute values are diverse enough?arrow_forward
- Explain why an index is only useful if there is sufficient variation in the values of an attribute.arrow_forwardExplain why an index is only helpful if the values of an attribute vary enough.arrow_forwardThe value range of an attribute must be large enough for the index to be relevant. Except for this one use case, an index is never helpful.arrow_forward
- Explain why an index is only effective when an attribute's values cover a suitable range of values. This is the sole situation in which an index is helpful.arrow_forwardExplain why an index is only helpful if an attribute's values cover a suitable range. This is the only scenario when an index is relevant.arrow_forwardWhen an attribute is part of a composite primary key, it's also a candidate key.arrow_forward
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