A _________ is a combinational circuit with a number of output lines, only one of which is asserted at any time.

What is a network security policy?

What will be an ideal response?

Available copies replication is applied to data items A and B with replicas Ax, Ay and Bm, Bn. The transactions T and U are defined

T: Read(A); Write(B, 44). U: Read(B); Write(A, 55). Show an interleaving of T and U, assuming that two-phase locks are applied to the replicas. Explain why locks alone cannot ensure one copy serializability if one of the replicas fails during the progress of T and U. Explain with reference to this example, how local validation ensures one copy serializability.