Chapter 18, Problem 5PE

Explanation of Solution

Schedules under the tree protocol

• Consider the tree structured graph A-B-C.
• Schedule that is possible under tree protocol but not under two phase locking protocol is:

T₁                T₂

lock(A)

lock(B)

unlock(A)

                lock(A)

lock(C)

unlock(B)

                lock(B)

    `      �...