The follow questions refer to the transaction schedule below, that records bookings of tickets for a harbour cruise. TIME ID TRANSACTION ID OPERATION 1 A Read Tickets left = 10 2 B Read Tickets left = 10 3 B Purchase 8 Tickets 4 A Purchase 6 Tickets 5 6 Using the transaction schedule above, explain the lost update problem Using the transation schedule above, explain how the two-phase locking protocol would prevent the lost update from occurring Using the transaction schedule above, explain the concept of Isolation as it relates to transaction management

The follow questions refer to the transaction schedule below, that records bookings of tickets for a harbour cruise. TIME ID TRANSACTION ID OPERATION 1 A Read Tickets left = 10 2 B Read Tickets left = 10 3 B Purchase 8 Tickets 4 A Purchase 6 Tickets 5 6 Using the transaction schedule above, explain the lost update problem Using the transation schedule above, explain how the two-phase locking protocol would prevent the lost update from occurring Using the transaction schedule above, explain the concept of Isolation as it relates to transaction management

Oracle 12c: SQL

3rd Edition

ISBN:9781305251038

Author:Joan Casteel

Publisher:Joan Casteel

Chapter6: Additional Database Objects

Section: Chapter Questions

Problem 8MC

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Consider the following schedule of transactionsW1(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 Serializableb) View Serializablec) Recoverable Please answer these question in detail with full explaination. I need a proper long answer. Thanks :)
Consider the following schedule of transactionsW1(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 Serializableb) View Serializablec) Recoverable I asked this question before but i think that was incorrect. Please answer these question in detail with full explaination. I need a proper long answer. Thanks .
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.
co5ds13h.Ch10.02 or 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…
How can "snapshot isolation" help in managing concurrent transactions without resorting to traditional locks?
How does the "serializability" property ensure transaction correctness?
How does two-phase locking (2PL) work, and what are its advantages in managing concurrent transactions?
Q4. Describe the procedure discussed in class regarding how to determine an equivalent serial schedule of a schedule with locks, if the schedule is allowed to finish under 2PL.
When a transaction is rolled-back under timestamp ordering, it is assigned a new timestamp. Why can it not simply keep its old timestamp?
Consider 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.
The WorkOrders table contains a foreign key, ClientNum, which must match the primary key of the Client table.a. What type of update to the WorkOrders table would violate referential integrity?b. If deletes do not cascade, what type of update to the Client table would violate referential integrity?c. If deletes do cascade, what would happen when a client was deleted?
Atomicity of transactions means that the transaction must be executed serially. True or False? Both committed and aborted transactions leave the database in consistent state. True or False?