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The Relational and CODASYL models are examples of two different approaches by which a Database Management System will be classified. Make a detailed comparison of each of these models, indicating clearly the relative advantages and disadvantages of each.
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.
Goal seek is what-if analysis in reverse.?
Answer the following statement true (T) or false (F)
The primary disadvantage of the WAIT and SIGNAL operation set is that it does not address busy waiting.
Answer the following statement true (T) or false (F)