Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Chapter 19, Problem 2PE
Explanation of Solution
Purpose of checkpoint
- Checkpoint is usually performed in conjunction with the log-based recovery system when a system crash occurs.
- In transactions which used checkpoints, all the modified buffer blocks till the checkpoint are written to the disk.
- Checkpoints reduce the recovery time of a system after a crash.
- When checkpointing is performed and a system crashes, then the modified buffer blocks till the checkpoint have been written to the disk...
Explanation of Solution
Performing checkpoints:
The frequency of performing checkpoints depends upon the requirements and resources of the system.
- The frequency of checkpoints is reduced when fast recovery is not critical to the system since the...
Explanation of Solution
Affecting the frequency of checkpoints:
- The frequency of checkpoints must be also as less as checkpoints when no failure occurs in a system since it causes some performance loss while they are being taken...
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Methods (Ch6) - Review
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There are two methods, method #1 which calculates the square root for positive integers, and
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public class SquareRoot {
public static void main(String[] args) {
}
// implement a loop of your choice here
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public static double myRoot(int number) {
double root;
root=number/2;
double root old;
do {
root old root;
root (root_old+number/root_old)/2;
} while (Math.abs(root_old-root)>1.8E-6);
return root;
}
// Method that calculates the square root of double variables
public static double myRoot(double number) {
double root;
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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