Consider the following schedule that performs actions taken by transactions 71 and T2 on data items A and BT1:R(B), W(B), W(A), CommitT2: R(B). W(B).OAltisarsaOB. It is an unrecoverable scheduleOC. It is a strict schedule.OD. It is a serial schedule.R(A),recoverable schedule.Abort

To answer this question, we first need to understand what a database schedule is and what makes a…

Answered: Consider the following schedule that…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Consider a database used by an airline, where "snapshot isolation" is used. It's possible that airlines might be willing to accept a non-serializable solution if it meant better overall performance.
Consider a database with objects X and Y. There are two transactions, as follows: T1: read(X), write(Y), write(X), commit T2: read(Y), write(X), write(Y), commit Give an example schedule that results in a Read-Write (RW) conflict. Explain why Strict Two-Phase Locking (Strict 2PL) would not allow your schedule from part (a) above. Give an example schedule that results in a Write-Write (WW) conflict. Explain why Strict Two-Phase Locking (Strict 2PL) would not allow your schedule from part (c) above.
In a database for an airline, "snapshot isolation" should be considered. Is a strategy that does not permit serialization a realistic alternative if airlines can enhance their overall performance?
Consider Case Study (2): World’s Trend Catalog Division. Case -2: World’s Trend Catalog Division World’s Trend is a mail order supplier of high-quality, fashionable clothing. Customers place orders by telephone, by mailing an order form included with each catalog, or via the Web site. When customer orders come in, the item master and the customer master files are both updated. If an item is out of stock, the inventory control department is notified. If the order is from a new customer, a new record is created in the customer master file. Picking slips are produced for the customer order and sent to the warehouse. A shipping statement is prepared. The process of shipping a customer order involves getting the goods from the warehouse and matching up the customer shipping statement, getting the correct customer address, and shipping it all to the customer. The customer statement is generated, and a billing statement is sent to a customer once a month. An accounts receivable report is sent…
In a database for an airline, "snapshot isolation" should be considered. Is a strategy that does not permit serialization a realistic alternative if airlines can enhance their overall performance?
In what ways does a strategy of avoiding deadlock differ from one of preventing deadlock?
Consider a database used by a major airline, where snapshot isolation is used by the underlying database management system. Although the airline would prefer a serializable execution, it may be willing to accept a non serializable execution if it means better overall speed.
Deadlock only happens when mutual exclusion, hold-and-wait, no preemption and circular wait are present. Define“circular wait” and explain how it contributes, potentially, to deadlock.
Consider the following two transactions: T1-R(B), W(B), R(C), R(A) T2-R(B). W(B) Say that sharing lock, exclusive lock, and unlock actions are inserted by the scheduler, resulting in the following annotated transactions: T1= X(B), R(B), W(B), S(C), R(C), S(A), U(B), R(A), U(C), U(A) T2-X(B), R(B), W(B), U(B) Cascading rollback is not possible for the above schedule. True False

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Consider the following schedule that performs actions taken by transactions 71 and T2 on data items A and B TI: R(B), W(B), W(A), Commit T2: R(B), W(B). R(A), OA It is a recoverable schedule. OB. It is an unrecoverable schedule. OC. It is a strict schedule. OD. It is a serial schedule. Abort