What are the major disadvantages of frequency division multiplexing??
What will be an ideal response?
Frequency division multiplexing suffers from two major disadvantages. The first disadvantage is found in computer-based systems that multiplex multiple channels over a single medium. Because the frequencies are usually statically assigned, devices that do not have anything to transmit are still assigned frequencies, and thus bandwidth is wasted. The second disadvantage of frequency division multiplexing is due to the fact that the technique uses analog signals, and analog signals are more susceptible to noise disruption than digital signals. Nonetheless, many different types of applications (such as television and radio) use frequency division multiplexing because of its simplicity, and the technique is probably going to be with us for a long time.?
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Suppose that transactions T1 and T2 can be decomposed into the subtransactions T1 : T1,1, T1,2 and T2 : T2,1, T2,2 such that each subtransaction individually maintains the consistency constraints of the database. Instead of guaranteeing that all schedules involving T1 and T2 are serializable, suppose that a concurrency control guarantees that all subtransactions are always executed serializably.
a. Will T1 always be serializable with T2? Explain. b. Will integrity constraints be maintained by all possible schedules? c. What possible problems might arise if the concurrency control schedules transactions in this way?