Chapter 19, Problem 2PE

Explanation of Solution

Purpose of checkpoint mechanism:

• 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...