Answered: 50à 55à 65à 37à 19à 11à 100à 150…

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

Problem 1PE

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Question

what is the right choise?

Assume a disk with 250 tracks and the head is initially at track 50. The requested tracks are the following: 37,22,19,11,55,65,100,150. Using SSTF which of the following is correct:

		50à 55à 65à 37à 19à 11à 100à 150
		50à 55à 65à 100à150à 37à 19à11
		50à 55à 65à 100à150à 37à 11à19
		50à 55à 65à 37à 11à 19à 100à 150

Expert Solution

Step 1

Initially at track 50.

Nearest track is 55.

Then nearest track is 65.

after that nearest track is 37.

then next track is 22

then next track is 19

then next track is 11

then next track is 100

and next nearest track is 150

22 missed in options. so nearest best answer is follows

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