DATABASE SYSTEMS
13th Edition
ISBN: 9780357095607
Author: Coronel
Publisher: CENGAGE L
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Chapter 12, Problem 12RQ
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Query optimization functions:
The objective of query optimization functions helps to reduce the costs related to
The cost related with database request is the function of,
- Cost for access time involved in accessing data which is stored on disk...
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- Why is it not desirable to force users to make an explicit choice of a queryprocessing strategy? Are there cases in which it is desirable for users tobe aware of the costs of competing query-processing strategies? Explain your answer.arrow_forwardTrue/False: Parallel processing in SQL can improve query performance by utilizing multiple threads.arrow_forwardHow does Index hunting help in improving query performance?arrow_forward
- In the process of query optimization, query cost refers to: A) How long it takes to execute a query. B) How much electricity is used to execute a query. C) How many query hints were used to execute a query. D) All of the above.arrow_forwardHow do query performance considerations differ between querying CLOBs and querying VARCHAR data types?arrow_forwardExplain the concept of distributed query processing. How are queries distributed and executed in a DDBMS?arrow_forward
- When working with a relational database, a select operation may be used to reduce the amount of space used by a table by removing columns that meet certain requirements.Is this the right answer or the wrong answer?arrow_forwardDatabasearrow_forwardWhat are referential constraint actions?arrow_forward
- SQL databases conform to ACID properties. Briefly describe the ACID properties, and state the purpose of each. How does conformance to ACID properties affect the performance of SQL databases?arrow_forwardWhat do you mean when you say "query optimization"?arrow_forwardExplain the role of indexing structures like B-trees and hash indexes in database systems. When and why might you choose one over the other?arrow_forward
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