Computer Science: An Overview (12th Edition)
12th Edition
ISBN: 9780133760064
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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I need an explanation when 2 schedules are conflict equivalent, with examples of conflict equivalent schedules.And examples where 2 schedules are not conflict equivalent. Please, be simple. Here is the Theorem, but I need someone to explain it better and use real example.
Suppose 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 same
We have the following transactions with associated schedulesT1: R(A) R(B) W(A)T2: R(A) R(B) W(A) W(B)a) Give the schedule of transactions T1 and T2 that leads to a WR conflict.b) Give the schedule of transactions T1 and T2 that lead to RW conflict.c) Give the schedule of transactions T1 and T2 that leads to a WW conflict.d) For each of the given schedules, show how a strict 2FZ would prevent this.
Chapter 9 Solutions
Computer Science: An Overview (12th 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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- The 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_forwardHow can deadlock possibility be influenced by the choice of a transaction boundary?arrow_forwardBuild a decision table and simplify the same. Customer can withdraw money from ATM. ATM machine pays out the amount if the customer enters correct pin and it customer has sufficient funds in their account or if the customer has the credit granted. ATM should also have enough funds to dispense the cash as per the customer request.arrow_forward
- In a dimensional model, how does the duration of a transaction normally appear?arrow_forwardAn analyst investigating University Student course registration system has found registration department applies the following rules: Student affairs department checks all applications for course registrations received by the campus. Student affairs first checks the pre requisite of the selected courses for each application and adds that credit to the student's fee balance. If the credit hour exceeds the limit defined for that program, student's application is rejected and is intimated to reselect the courses as per defined limit of credit hours. All such students who have selected the courses according to university policy their fee voucher is generated and that the fee voucher has been passed to the accounts manager who will contact them in the next three days. After the payment of fee, confirmation is to be sent by accounts manager through SMS. In case fee voucher is generated and is not collected by the student reminder message is sent reminding the student of the payment of fees.…arrow_forwardc) Consider a scenario where a fraudulent dealer sends an electronic message to a stock agent, asking him to buy $5,000 worth of shares in CryptoBitCoin. The following day the value of CryptoBitCoin shares rises significantly. The dealer now acts that his original message was asking to purchase $50,000 worth of shares. On the contrary, if the share price drop, the dealer might act that the original message asked to buy shares in KryptoBitCoin instead. Based on this scenario, would you consider the dealer's action a breach of any information security goal(s)? If your answer is no, clearly explain the reasoning behind your answer. If your answer is yes, identify the breached security goal(s) with necessary explanation of your answer, and recommend suitable primitive(s) that can be used to address the corresponding security goal(s).arrow_forward
- Alice and Bob now decide to use Diffie-Hellman Key Exchange (DHKE) (p. 343) with certificates. Both Alice and Bob agree on p=23 and α=5. Alice chooses a=7 and Bob chooses b=13. Answer the following. What is the public key generated by Alice? What is the public key generated by Bob? What is the computed shared key by Alice? What is the computed shared key by Bob?arrow_forward(b) Consider the following schedule of two transactions: R(B) в€ 100 - В W(B) R(A) R(A) R(B) A € 10A + B в € 2B + A A € 30 + 7B W(A) W(A) W(B) Figure 3: Schedule of Q5(b). i. Result-serializability is when the result of a schedule is the same as some serial 10 and B = 20, show if this schedule is schedule. Given the initial values A result-serializable or not. ii. Show how to add locks/unlocks to make the two transactions T1 and T2 conflict serializable.arrow_forwardQ4 Authentication is very important in ecommerce system. The above model is a method to authenticate the two entities participating in the ecommerce transaction system. Explain he procedure how authentication is performed using given model? model in picturearrow_forward
- The lost update anomaly is said to occur if a transaction Tj reads a data item, then another transaction Tk writes the data item (possibly based on a previous read), after which Tj writes the data item. The update performed by Tk has been lost, since the update done by Tj ignored the value written by Tk. a. Give an example of a schedule showing the lost update anomaly. b. Give an example schedule to show that the lost update anomaly is possible with the read committed isolation level. c. Explain why the lost update anomaly is not possible with the repeatable read isolation level.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_forwardSubject :databasearrow_forward
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