Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 10, Problem 7P
Program Plan Intro
Transaction log:
It is a feature used by the DBMS (
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Chapter 10 Solutions
Database Systems: Design, Implementation, & Management
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- Consider three transactions: T1, T2, and T3. S: W1(A); R2(A);W3(B); W2(A);W1(A); R2(C); R3(B); R3(A); W3(B); C1;C2;C3 a) Draw the precedence graph for the schedule. Is the schedule conflict- serializable? b) Is the schedule recoverable?arrow_forwardIn a dimensional model, how does one commonly express the time it takes to complete a transaction?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_forward
- The kind of recurrent transaction that notifies us whenever we should utilize an existing recurring transaction as the basis for entering a new transaction isarrow_forwardDiscuss the concept of isolation levels and their impact on the behavior of concurrent transactions.arrow_forward65. The phenomenon in which one failure leads to a series of transaction rollbacks is called as ________ a. Cascading rollback b. Cascadeless rollback c. Cascade cause d. None of the mentionedarrow_forward
- For the following two transactions and the initial table values as shown complete the missing blanks in the transaction log below: Part_ID Desrption OnHand OnOrder 57 Assembled Foo 5 0 987 Foo Fastener 12 7 989 Foo Half 7 0 BEGIN TRANSACTION; UPDATE Part SET OnHand = OnHand + 7, OnOrder = OnOrder – 7 WHERE Part_ID = 987; COMMIT; BEGIN TRANSACTION; UPDATE Part SET OnHand = OnHand - 4 WHERE Part_ID = 987; UPDATE Part SET OnHand = OnHand - 2 WHERE Part_ID = 989; UPDATE Part SET OnHand = OnHand + 1 WHERE Part_ID = 57; COMMIT TRL_ID TRX_ID PREV_PTR NEXT_PTR OPERATION TABLE ROW ID ATTRIBUTE BEFORE VALUE AFTER VALUE 1787 109 NULL START **** 1788 109 1787 UPDATE PART 987 OnHand 12 1789 109 UPDATE PART 987 OnOrder 7 1790 109 NULL COMMIT **** 1791 110 NULL START **** 1792 110 UPDATE…arrow_forwardI want you to name the top three issues that emerge while dealing with transactions all at once. Demonstrate how these issues might be avoided via the use of concurrency control.arrow_forwardSubject 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_forward
- A new timestamp will be applied to a transaction in line with the ordering of timestamps if that transaction is rolled back. Why is it that it can't just keep the timestamp that it had before?arrow_forwardConsider the following schedule of transactions W1(A) W2(A) W1(A) W2(A) W1(A) Which of the following properties are true for the above schedule and justify the reason for your answer with explanation? a) Conflict Serializable b) View Serializable c) Recoverablearrow_forwardWhat is the motivation for splitting a long transaction into a series of small ones? What problems could arise as a result, and how can these problems be averted?arrow_forward
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