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To optimize disk /O cost, if you frequently have to access the pages of a file in sequential order. How would you lay those pages on disk? Consider the architecture of a typical modern disk consisting of platters, tracks, cylinders e

To optimize disk /O cost, if you frequently have to access the pages of a file in sequential order. How would you lay those pages on disk? Consider the architecture of a typical modern disk consisting of platters, tracks, cylinders e

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Problem 27: a- To optimize disk /O cost, if you frequently have to access the pages of a file in sequential order. How would you lay those pages on disk? Consider the architecture of a typical modern disk consisting of platters, tracks, cylinders etc. b- In terms of what the disk has to do for each, what is the difference ‘between random and sequential /O? - To improve the performance of the query, choose an index configuration? Briefly justify your answer. SELECT * FROM employee WHERE Name = ‘Julien’ AND workingHours > 10 > Choose one and explain briefly why . - A hash index on < workingHours > . - An unclustered tree index on < workingHours > . -An unclustered tre index on . A clustered tree index on < workingHours, Name>
Problem 27: a- To optimize disk I/O cost, if you frequently have to access the pages of a file in sequential order. How would you lay those pages on disk? Consider the architecture of a typical modern disk consisting of platters, tracks, cylinders etc. b- In terms of what the disk has to do for each, what is the difference between random and sequential I/O? c- To improve the performance of the query, choose an index configuration? Briefly justify your answer. SELECT * FROM employee WHERE Name = 'Julien' AND workingHours > 10 Choose one and explain briefly why .- A hash index on < workingHours > - An unclustered tree index on < workingHours > -An unclustered tree index on <Name> A clustered tree index on < workingHours, Name>
Transcribed Image Text:Problem 27: a- To optimize disk I/O cost, if you frequently have to access the pages of a file in sequential order. How would you lay those pages on disk? Consider the architecture of a typical modern disk consisting of platters, tracks, cylinders etc. b- In terms of what the disk has to do for each, what is the difference between random and sequential I/O? c- To improve the performance of the query, choose an index configuration? Briefly justify your answer. SELECT * FROM employee WHERE Name = 'Julien' AND workingHours > 10 Choose one and explain briefly why .- A hash index on < workingHours > - An unclustered tree index on < workingHours > -An unclustered tree index on <Name> A clustered tree index on < workingHours, Name>
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