Computer Science: An Overview (13th Edition) (What's New in Computer Science)
13th Edition
ISBN: 9780134875460
Author: Glenn Brookshear, Dennis Brylow
Publisher: PEARSON
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Chapter 9.4, Problem 3QE
Program Plan Intro
Interweaving of transactions:
If two or more transactions are processed from the same account in small interval of time, it is known as interweaving of transactions.
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Consider the following two transactions:T34: read(A);read(B);if A = 0 then B := B + 1;write(B).T35: read(B);read(A);if B = 0 then A := A + 1;write(A).Add lock and unlock instructions to transactions T31 and T32 so that they observe the two-phase locking protocol. Can the execution of these transactionsresult in a deadlock?
Explain optimistic and pessimistic timestamp ordering (TO) with an example scenario of two concurrent transactions.
Show that the two-phase locking protocol ensures conflict serializability and that transactions can be serialized according to their lock points.
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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- Subject code - rcs502 Consider 3 transactions T₁, T₂ and T3 having 2, 3 and 4 operations respectively. Find number of concurrent schedules. (a) 630 (c) 2520 (b) 1260 (d) 2440 I will downvote ,if u do anything wrong.arrow_forwardSuppose you have trained an anomaly detection system for fraud detection, and your system that flags anomalies when p(x) is less than ε, and you find on the cross-validation set that it is mis-detecting many fradulent transactions (i.e., failing to flag them as anomalies). What should you do? Group of answer choices a. Cannot be determined b. Increase ε c. Keep ε samearrow_forwardConsider the following two transactions: T1: R(x),R(Y),Y=Y+2,W(Y) T2:R(Y),R(X),X=X+10,W(X) Rewrite transction T1 and T2 by applying the tow phase locking algorithm? Is the T1 and T2 offers deadlock? Suport your answer by example.arrow_forward
- Consider the schedule S1 = w1(A), r2(A), w1(B), w3(C), r2(C), r4(B), w2(D), w4(E), r5(D), w5(E) on five transactions T1, T2, . . . , T5. How many serial and how many non-serial schedules the above transactions T1, T2, . . . , T5 can have?arrow_forwardIf any transaction fails (due to any system failure or other causes) before being committed, it is called a transaction. Another instance when there is a difference in total amount before and after a transaction there is a discrepancy between the sending and receiving amount.To address the issues in the above scenario, explain which characteristics of transaction are needed to solve the problems.arrow_forwardConsider a schedule with 4 transactions with 1, 2, 3, and 4 operations respectively. Calculate the possible number ofa) Serial schedulesb) Non serial schedules Please answer these question in detail with full explaination. I need a proper long answer. Thanks :)arrow_forward
- Consider a schedule with 3 transactions with 2, 3, and 4 operations respectively. Calculate the possiblenumber ofc) Serial schedulesd) Non serial schedulesarrow_forwardConsider the schedule S1 consists of three transactions T1, T2, T3 as the following: Answer the following question: Is the schedule S1 cascadeless and recoverable? Justify your answer. Draw the precedence graph of schedule S1 Is S1 conflict-serializable? Explain briefly. If S1 is conflict-serializable, write down all equivalent serial schedules.arrow_forwardIdentify which of the following transactions are conflict serialazable. a) R1(x);R2(y);W1(x);W2(x);W3(X);W3(Y);W1(Y) b) R2(x);R1(X);R2(Z);W2(Z);W2(Z);W2(X);R1(Z);W1(X)arrow_forward
- How does "cascadeless recoverability" prevent cascading aborts in transactions?arrow_forwardAssume that two concurrent executing transactions T₁ and T₂ are allowed to update same stock item say 'A' in an uncontrolled manner. In such scenario. Give the problems no concurrency module and allows concurrent execution.arrow_forwardThe Apriori algorithm only consider distinct items in a transaction. In practice, multiple occurrences of an item in the same transaction can be important. Propose modifications to the Apriori algorithm to adapt to this situation.arrow_forward
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