Chapter 10, Problem 8RQ

Explanation of Solution

Lock:

Lock is the process that ensures the unique use of data item for particular transaction. If the data item is locked by one transaction, then the other transactions cannot use the data item until the first transaction unlocks the data item.

Working procedure of lock:

• A transaction requires lock prior to lock and unlock the transactions. The lock prior is responsible for assigning and releasing locks. It is otherwise called as “lock manager”...