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Database Systems
1. List the ACID properties. Explain the usefulness of each.
2. Consider the following two transactions: T13: read(A);read(B);if A = 0 then B := B + 1;write(B).T14: read(B);read(A);if B = 0 then A := A + 1;write(A).Let the consistency requirement be A = 0 or B = 0, with A = 0 and B = 0 as the initial values.a. Show that every serial execution involving these two transactions preserves the consistency of the database.b. Show a concurrent execution of T13 and T14 that produces a nonserializable schedule.c. Is there a concurrent execution of T13 and T14 that produces a serializable schedule?
3. What is the two-phase locking protocol? What is the strict two-phase locking protocol? What is the rigorous two-phase locking protocol? What benefit does strict two-phase locking protocol provide? What benefit does rigorous two-phase locking protocol provide?
4. Consider the log in Figure. Suppose there is a crash just before the <T0 abort> log record is written out. Explain what would happen during recovery.
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question 1. the systems analyst proposes the subsequent two relationships between the flight and pilot entities what
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