A disk drive has 24 cylinders (0-23). Initially, the head points to cylinder 8 (moving towards cy For C-SCAN and C-LOOK, requests are serviced while the head is moving from inner cylinde outer cylinder (23). You must count also the cylinders when the head is moving without The following requests are in the queue (where the requests arrival is from left to right): 11 - 3 - 17 - 4 - 10 - 12 - 8 - 9 - 22 - 13. What is the total head movements using the following scheduling algorithms: a) FCFS: b) C-SCAN: c) SSTF: d) C-LOOK:

A disk drive has 24 cylinders (0-23). Initially, the head points to cylinder 8 (moving towards cy For C-SCAN and C-LOOK, requests are serviced while the head is moving from inner cylinde outer cylinder (23). You must count also the cylinders when the head is moving without The following requests are in the queue (where the requests arrival is from left to right): 11 - 3 - 17 - 4 - 10 - 12 - 8 - 9 - 22 - 13. What is the total head movements using the following scheduling algorithms: a) FCFS: b) C-SCAN: c) SSTF: d) C-LOOK:

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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Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.

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A disk drive has 24 cylinders (0-23). Initially, the head points to cylinder 8 (moving towards cylinder 0).
For C-SCAN and C-LOOK, requests are serviced while the head is moving from inner cylinder (0) to
outer cylinder (23). You must count also the cylinders when the head is moving without servicing.
The following requests are in the queue (where the requests arrival is from left to right):
11 - 3- 17 - 4 - 10 - 12 - 8 - 9 - 22 - 13.
What is the total head movements using the following scheduling algorithms:
a) FCFS:
b) C-SCAN:
c) SSTF:
d) C-LOOK:

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