Computer Science: An Overview (13th Edition) (What's New in Computer Science)
13th Edition
ISBN: 9780134875583
Author: BROOKSHEAR
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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W-timestamp(Q) is the biggest timestamp of any transaction that successfully completed write(Q). Instead, let's say we specified it as the timestamp of the most recent transaction that successfully executed write(Q). Is it possible that this adjustment in language will make a difference? Explain your response.
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.
How do "savepoints" differ from regular commit points in transaction lifecycles?
Chapter 9 Solutions
Computer Science: An Overview (13th Edition) (What's New in Computer Science)
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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Similar questions
- What are the differences between preventing a deadlock and preventing it from occurring?arrow_forwardUnder what circumstances does the wait-die scheme perform better than the wound-wait scheme for granting resources to concurrently executing transactions?arrow_forwardIf 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?arrow_forward
- How do "read-write" and "read-only" transactions differ in their behavior?arrow_forwardDescribe the implications of using a "read committed" isolation level in a transaction.arrow_forwardA 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_forward
- What is the key difference between trying to avoid a deadlock and trying to prevent one from occurring?arrow_forwardTransactions might take a long time to finish when an optimistic approach is taken to concurrency control. Explain?arrow_forwardWhen an optimistic strategy for concurrency management is adopted, it may commonly cause transactions to wind up taking a very lengthy time. Explain?arrow_forward
- 18. Which is not a desirable property of a transaction ? a. Isolation b. Atomicity c. Durability d. All are desirablearrow_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_forwardA transaction's processing time may be slowed when using optimistic concurrency control. Explain?arrow_forward
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