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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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#ComputerOrganizationandArchitectureCourse

1. Answer the question Performance Measurement. Elaborate your answer in an essay form.

a) A company that is selling database management optimization software contacts you to pitch its product. The representative claims that the memory management software will reduce page fault rates for your system. She offers you a 30-day free trial of this software. Before you install it, however, you decide to first determine a baseline for your system. At specific times of the day, you sample and record the page fault rate of your system (using the system’s diagnostic software). You do the same after the software has been installed. How much of an average performance improvement has the new software provided? (Hint: Use the harmonic mean.) The fault rates and times of day are shown in the table below.

in the table below.
Fault Rate
Fault Rate
Time
Before
After
02:00-
35%
45%
03:00
10:00-
42%
38%
11:00
13:00-
12%
10%
14:00
18:00-
20%
22%
W
19:00

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