1.What is a certify lock? What are the advantages and disadvantages of using certify
locks? 2. How do optimistic concurrency control techniques differ from other concurrency
control techniques! Why are they also called validation or certification techniques?
Discuss the typical phases of an optimistic concurrency control method.
3. How does the granularity of data items affect the performance of concurrency control? What factors affect selection of granularity size for data items!