DATABASE SYSTEMS
13th Edition
ISBN: 9780357095607
Author: Coronel
Publisher: CENGAGE L
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Chapter 9, Problem 13RQ
Program Plan Intro
- The second stage of DBLC (Database Life cycle) is the database design.
- DBLC is a sequential process which is used to trace the history of the application that is present within the
information system . - The design phase consists of three stages and they are:
- Conceptual design
- Design a database that is independent of software and physical details.
- Logical design
- The main design goal is to make an enterprise wide database.
- Design a database that is based on the specific data model but independent of physical details.
- Physical design
- It is used to determine the storage capabilities of the data in an organization and its access characteristics.
- It ensures the integrity, security and performance.
- Conceptual design
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Methods (Ch6) - Review
1. (The MyRoot method) Below is a manual implementation of the Math.sqrt() method in Java.
There are two methods, method #1 which calculates the square root for positive integers, and
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public static void main(String[] args) {
}
// implement a loop of your choice here
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public static double myRoot(int number) {
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root=number/2;
double root old;
do {
root old root;
root (root_old+number/root_old)/2;
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return root;
}
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public static double myRoot(double number) {
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root number/2;
double root_old;
do {
root old root;
root (root_old+number/root_old)/2;
while (Math.abs (root_old-root)>1.0E-6);
return root;
}
}
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