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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

Problem 1PE

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A computing system is composed of two servers that are mirrors of each other (for
redundancy, so if one fails, it can be restored from the other). Assume that each server
has an expected MTBF of 500 hours and its continuous uptimes (the average of which
is MTBF) follow an Exponential Distribution. Furthermore, assume that when a server
fails, it takes exactly 10 hours to restore the data from the mirror.
(a) Write a program that generates synthetic data showing the failure and restoration
times for each server over 20 years. You can assume it is always exact 24 hours per day
and exact 365 days per year.

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We have n glasses which can hold a varying amount of liquid. We will say that glass1 is size q1 quarts and glass2 is size q2 quarts, etc. We now give you a size, say x quarts. You must give me a glass of exactly x quarts. You are allowed to fill any glass to exactly its size and to pour any liquid from one glass into another. When you pour, you either have to empty the glass you are pouring from or fill the glass you are pouring into. Can you do it?More concrete example: G1 has size 10 quarts. G2 has size 4 quarts. G3 has size 1 quart. You can get a 5 quart drink by filling G1, pouring 4 quarts from it into G2 and 1 quart of it into G1. After that, G1 has exactly 5 quarts. In the same problem, we could get 8 quarts by filling G2 twice and emptying it into G1 twice. Given This: Write an algorithm to do this and determine its complexity.
Create an efficient java code to solve the problem by using dynamic programming
Consider the software that runs in an Automated Teller Machine (ATM) machine. One task that must be able to be performed is to determine the type (denomination) of currency and the numbers of bills (aka “banknotes” for those of you not from North America) for each type dispensed. A requirement is that our ATM use the fewest number of bills that it can to dispense the specified amount of money. It only dispenses fifties, twenties, tens, fives, and ones. Design and implement program that writes out what bills would be dispensed if this machine existed for the amount of money that was asked for by the user.Test CasesIn the comments at the top of your file, list 3 test cases that you came up with. Something like this but choose your own examples. You should write your test cases in such a way that, if they all pass, you can be fairly confident your program will work all the time. '''Test case #1:Input: $1Output: 0 fifties, 0 twenties, 0 tens, 0 fives, 1 onesTest case #2:Input: $22Output:…

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