Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Consider the following schedules involving tw...
Start Learning for Free
Consider the following schedules involving two transactions:
S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)
S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)
S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)
Which of the following statements is TRUE?
- a)Both S1 and S2 are conflict serializable.
- b)S1 is conflict serializable and S2 is not conflict serializable.
- c)S1 is not conflict serializable and S2 is conflict serializable.
- d)Both S1 and S2 are not conflict serializable.
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
Consider the following schedules involving two transactions:S1 : r1 (X...
Consider S1 schedule:
S1
r1(X) → Read X process 1
r1(Y) → Read Y process 1
r2(X) → Read X process 2
r2(Y) → Read Y process 2
w2(Y) → But this write cause r1(Y)
w1(X) → The value is obsolete, so S1 is not conflict serializable.
S1
r1(X) → Read X process 1
r1(Y) → Read Y process 1
r2(X) → Read X process 2
r2(Y) → Read Y process 2
w2(Y) → But this write cause r1(Y)
w1(X) → The value is obsolete, so S1 is not conflict serializable.
Consider S2 schedule:
S2
r1(X) → Read X by process 1
r2(X) → Read X by process 2
r2(Y) → Read Y by process 3
w2(Y) →
Even here, there is no problem, since only transaction 2 has read Y and w1(X) is manipulating.
r1(Y) takes place after the above step, and S2 is thus conflict serializable.
S2
r1(X) → Read X by process 1
r2(X) → Read X by process 2
r2(Y) → Read Y by process 3
w2(Y) →
Even here, there is no problem, since only transaction 2 has read Y and w1(X) is manipulating.
r1(Y) takes place after the above step, and S2 is thus conflict serializable.
Free Test
FREE
| Start Free Test |
Community Answer
Consider the following schedules involving two transactions:S1 : r1 (X...
Explanation:
Determine Conflict Serializable:
- To determine if a schedule is conflict serializable, we need to check if the schedule can be transformed into an equivalent serial schedule by swapping non-conflicting operations.
S1 Analysis:
- S1: r1(X); r1(Y); r2(X); r2(Y); w2(Y); w1(X)
- The conflicting pairs are r1(X) and w1(X) which creates a conflict.
- As there is a conflict in S1, it is not conflict serializable.
S2 Analysis:
- S2: r1(X); r2(Y); r2(X); w2(Y); r1(Y); w1(X)
- The conflicting pairs are r1(X) and w1(X), r2(Y) and w2(Y) which create conflicts.
- By swapping non-conflicting operations, we can transform S2 into an equivalent serial schedule: r1(X); w1(X); r2(Y); w2(Y); r1(Y); r2(X)
- Since S2 can be transformed into an equivalent serial schedule, it is conflict serializable.
Therefore, the correct statement is:
S1 is not conflict serializable and S2 is conflict serializable (Option C).
Attention Computer Science Engineering (CSE) Students!
To make sure you are not studying endlessly, EduRev has designed Computer Science Engineering (CSE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Computer Science Engineering (CSE).
|
Explore Courses for Computer Science Engineering (CSE) exam
|
|
Similar Computer Science Engineering (CSE) Doubts
Top Courses for Computer Science Engineering (CSE)View all
Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer?
Question Description
Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer?.
Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE).
Download more important topics, notes, lectures and mock test series for Computer Science Engineering (CSE) Exam by signing up for free.
Here you can find the meaning of Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider the following schedules involving two transactions:S1 : r1 (X); r1 (Y); r2 (X); r2 (Y); w2 (Y); W1 (X)S2 : r1 (X); r2 (Y); r2 (X); w2 (Y); r1 (Y); W1 (X)Which of the following statements is TRUE?a)Both S1 and S2 are conflict serializable.b)S1 is conflict serializable and S2 is not conflict serializable.c)S1 is not conflict serializable and S2 is conflict serializable.d)Both S1 and S2 are not conflict serializable.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
|
|
Explore Courses for Computer Science Engineering (CSE) exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup