Consider the schedule below. Here, R(*) and W(*) stand for 'Read' and Write', respectively. T1, T2, T3, T4 and T5 represent five transactions and ti represents a time slot. ti t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 t16 t17 t18 T1 R(A) R(B) W(A) W(B) T2 R(C) W(C) T3 R(B) R(C) W(B) W(C) T4 R(D) W(D) R(A) W(A) T5 R(C) R(A) W(C) W(A) Each transaction begins at the time slot of its first Read and commits right after its last Write (same time slot). Regarding the following questions, give and justify your answers. 1) Assume a checkpoint is made between ts and t6, what should be done to the five transactions when the crash happens between t15 and t16. 2) Is the transaction schedule conflict serializable? Give the precedence graph to justify your answer.
Consider the schedule below. Here, R(*) and W(*) stand for 'Read' and Write', respectively. T1, T2, T3, T4 and T5 represent five transactions and ti represents a time slot. ti t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12 t13 t14 t15 t16 t17 t18 T1 R(A) R(B) W(A) W(B) T2 R(C) W(C) T3 R(B) R(C) W(B) W(C) T4 R(D) W(D) R(A) W(A) T5 R(C) R(A) W(C) W(A) Each transaction begins at the time slot of its first Read and commits right after its last Write (same time slot). Regarding the following questions, give and justify your answers. 1) Assume a checkpoint is made between ts and t6, what should be done to the five transactions when the crash happens between t15 and t16. 2) Is the transaction schedule conflict serializable? Give the precedence graph to justify your answer.
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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Transcribed Image Text:Consider the schedule below. Here, R(*) and W(*) stand for 'Read' and Write’,
respectively. T1, T2, T3, T4 and T5 represent five transactions and ti represents a
time slot.
ti t2 t3 t4
t5 t6
t7
t8 t9 t10 t11 t12 t13 t14 t15 t16 ti17 t18
T1
R(A)
R(B)
W(A)
W(B)
T2 R(C)
W(C)
T3
R(B)
R(C)
W(B) W(C)
T4
R(D)
W(D) R(A)
W(A)
T5
R(C)
R(A)
W(C)
W(A)
Each transaction begins at the time slot of its first Read and commits right after
its last Write (same time slot).
Regarding the following questions, give and justify your answers.
1) Assume a checkpoint is made between ts and t6, what should be done to the
five transactions when the crash happens between t15 and t16.
2) Is the transaction schedule conflict serializable? Give the precedence graph to
justify your answer.
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