Computer Science An Overview Ap Edition
13th Edition
ISBN: 9780134891729
Author: J. Glenn Brookshear, Dennis Brylow
Publisher: PEARSON
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Chapter 9.4, Problem 1QE
Program Plan Intro
Commit:
Commit is used to save any transaction permanently into the
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In a database transaction, the two main operations are READ and WRITE operations. So, there is a need to manage these two operations in the concurrent execution of the transactions as
if these operations are not performed in an interleaved manner, and the data may become inconsistent.
Consider the following scheduled transactions T1, T2, T3, and T4.
T1
T2
T3
T4
Reads(X)
Writes(X)
Reads(Y)
Writes(Y)
Commit
Reads(X)
Time
Reads(X)
Writes(X)
Reads(Y)
Rollback
Writes(Y)
Writes(X)
Commit
• Identify all pair of transactions based on the occurred problem between two transactions (specify pairs, e.g., T1 => T2; T3=> T2; T3 =>T4; etc.).
• Specify the name of a problem for each detected pair of transactions.
• Justify the occurred problem for each pair of transactions.
Under what circumstances does the wait-die scheme perform better
than the wound-wait scheme for granting resources to concurrently
executing transactions?
If you want to get the most out of this example, you should definitely begin by using a database that is "snapshot isolated" and is controlled by an airline. This will allow you to get the most out of this example. What if, rather than an operation that can be serialized, the improved overall performance of the airline was due to an execution that cannot be serialized?
Chapter 9 Solutions
Computer Science An Overview Ap Edition
Ch. 9.1 - Identify two departments in a manufacturing plant...Ch. 9.1 - Prob. 2QECh. 9.1 - Summarize the roles of the application software...Ch. 9.2 - Prob. 1QECh. 9.2 - Prob. 2QECh. 9.2 - Prob. 4QECh. 9.2 - Prob. 5QECh. 9.2 - Prob. 6QECh. 9.3 - Prob. 1QECh. 9.3 - What is a persistent object?
Ch. 9.3 - Identify some classes as well as some of their...Ch. 9.3 - Prob. 4QECh. 9.4 - Prob. 1QECh. 9.4 - Prob. 2QECh. 9.4 - Prob. 3QECh. 9.4 - Prob. 4QECh. 9.4 - Prob. 5QECh. 9.4 - Prob. 6QECh. 9.5 - Prob. 1QECh. 9.5 - Prob. 2QECh. 9.5 - Prob. 3QECh. 9.5 - Prob. 4QECh. 9.5 - Prob. 5QECh. 9.5 - Prob. 6QECh. 9.5 - Prob. 7QECh. 9.6 - Prob. 1QECh. 9.6 - Give an additional example of a pattern that might...Ch. 9.6 - Prob. 3QECh. 9.6 - How does data mining differ from traditional...Ch. 9.7 - Prob. 1QECh. 9.7 - Prob. 2QECh. 9.7 - Prob. 3QECh. 9.7 - Prob. 4QECh. 9 - Prob. 1CRPCh. 9 - Prob. 2CRPCh. 9 - Prob. 3CRPCh. 9 - Prob. 4CRPCh. 9 - Prob. 5CRPCh. 9 - Prob. 6CRPCh. 9 - Prob. 7CRPCh. 9 - Prob. 8CRPCh. 9 - Prob. 9CRPCh. 9 - Prob. 10CRPCh. 9 - Prob. 11CRPCh. 9 - Prob. 12CRPCh. 9 - Using the commands SELECT, PROJECT, and JOIN,...Ch. 9 - Answer Problem 13 using SQL. PROBLEM 13 13. Using...Ch. 9 - Prob. 15CRPCh. 9 - Prob. 16CRPCh. 9 - Prob. 17CRPCh. 9 - Prob. 18CRPCh. 9 - Prob. 19CRPCh. 9 - Empl Id Name Address SSN Job Id Job Title Skill...Ch. 9 - Empl Id Name Address SSN Job Id Job Title Skill...Ch. 9 - Prob. 22CRPCh. 9 - Prob. 23CRPCh. 9 - Prob. 24CRPCh. 9 - Prob. 25CRPCh. 9 - Write a sequence of instructions (using the...Ch. 9 - Prob. 27CRPCh. 9 - Prob. 28CRPCh. 9 - Prob. 29CRPCh. 9 - Prob. 30CRPCh. 9 - Prob. 31CRPCh. 9 - Prob. 32CRPCh. 9 - Prob. 33CRPCh. 9 - Prob. 34CRPCh. 9 - Prob. 35CRPCh. 9 - Prob. 36CRPCh. 9 - Prob. 37CRPCh. 9 - Prob. 38CRPCh. 9 - Prob. 39CRPCh. 9 - Prob. 40CRPCh. 9 - Prob. 41CRPCh. 9 - Prob. 42CRPCh. 9 - Prob. 43CRPCh. 9 - Prob. 44CRPCh. 9 - Prob. 45CRPCh. 9 - Prob. 46CRPCh. 9 - Prob. 47CRPCh. 9 - Prob. 48CRPCh. 9 - Prob. 49CRPCh. 9 - Prob. 50CRPCh. 9 - Prob. 51CRPCh. 9 - Prob. 52CRPCh. 9 - Prob. 53CRPCh. 9 - Prob. 54CRPCh. 9 - Prob. 55CRPCh. 9 - Prob. 56CRPCh. 9 - Prob. 57CRPCh. 9 - Prob. 58CRPCh. 9 - Prob. 59CRPCh. 9 - Prob. 60CRPCh. 9 - Prob. 61CRPCh. 9 - Prob. 62CRPCh. 9 - Prob. 1SICh. 9 - Prob. 2SICh. 9 - Prob. 3SICh. 9 - Prob. 4SICh. 9 - Prob. 5SICh. 9 - Prob. 6SICh. 9 - Prob. 7SICh. 9 - Prob. 8SICh. 9 - Prob. 9SICh. 9 - Prob. 10SI
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- A transaction passes through different states when it is initiated.Explain the each state by taking some example transaction to support your answer that when the transaction will be assigned to the specific state.arrow_forwardTransactions might take a long time to finish when an optimistic approach is taken to concurrency control. Explain?arrow_forwardAs an example, think of a database for an airline that uses something called "snapshot isolation." If the overall performance of the airline can be improved, it's possible that non-serializable executions might be acceptable.arrow_forward
- A transaction's processing time may be slowed when using optimistic concurrency control. Explain?arrow_forwardWhat's the Difference Between Trying to Prevent a Deadlock and Trying to Avoid One?arrow_forwardUnder what circumstances is it cheaper to prevent deadlock than to allow deadlock to exist and then detect it?arrow_forward
- It is important to consider the many different approaches that might be used to break a deadlock.arrow_forwardTransactions often take a very long time to finish when an optimistic approach to concurrency management is used. Explain.arrow_forwardIt goes through a lot of different states during its execution, until it either commits or cancels itself out at the end. Make a list of all the possible ways a transaction could go through. Explain why each state change might happen.arrow_forward
- If you want to get the most out of this example, you should probably start with a database that is managed by an airline and uses "snapshot isolation." What if, rather than a serializable execution, a non-serializable execution was responsible for the increased overall performance of the airline?arrow_forwardGive an example of a serializable schedule with two transactions such that the order in which the transactions commit is different fromthe serialization order.arrow_forwardConsider the schedule below. Here, R(*) and W(*) stand for 'Read' and 'Write', respectively. T1, T2, T3, T4 and T5 represent five transactions and ti represents a time slot. ti t2 t3 t4 t5 t6 t7 t8 t9 ti0 t11 t12 t13 t14 t15 t16 t17 t18 T1 R(A) R(B) W(A) W(B) T2 R(C) W(C) T3 R(B) R(C) W(B) W(C) T4 R(D) W(D) R(A) W(A) T5 R(C) R(A) W(C) W(A) Each transaction begins at the time slot of its first Read and commits right after its last Write (same time slot). Regarding the following questions, give and justify your answers. 3) Construct a schedule (which is different from above) of these five transactions which causes deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in your schedule. If no such schedule exists, explain why. 4) Construct a schedule (which is different from above) of these five transactions which does not cause deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the…arrow_forward
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