Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 12, Problem 1RQ
Explanation of Solution
Evolution from centralized
During the year 1970s, the centralized DBMS was implemented and the use of centralized DBMS stores the corporate data in single central site and providing the data access to dumb the terminals.
It worked well to fill the corporations structured information requirements, but it little drop at time of rapidly moving events needs quicker reply times and similarly rapid access to information.
At this time, the distributed database design is started with impact of internet. The success of internet and mobile technologies will increase use of the distributed database.
- The database management system supports the database distributed over the numerous different sites.
- Distributed DBMS manages the storage and processing of logically associated data across the connected systems wherein both “data” and “processing functions” are distributed between various sites.
In any case, distributed database are possible to identify the development of future database, mostly for particular mobile applications. This is specially needed because centralized database management is subject to such as high costs, reliability issues, scalability issues, performance degradation, and organization rigidity.
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7. See the code below and solve the following.
public class Test {
public static void main(String[] args) {
int result = 0;
}
result = fn(2,3);
System.out.println("The result is:
+ result);
// fn(x, 1) = x
// fn(x, y)
=
fn(x, y-1) + 2, when y>1
public static int fn(int x, int y) {
if (x <= 1)
return x;
else
return fn(x, y-1) + 2;
}
}
7-1. This program has a bug that leads to infinite recursion. Modify fn(int x, int y) method to fix
the problem. (2 point)
7-2. Manually trace the recursive call, fn(2,3) and show the output (step by step). (2 point)
7-3. Can you identify the Base Case in recursive method fn(int x, int y)? (1 point)
Chapter 12 Solutions
Database Systems: Design, Implementation, & Management
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