GATE Exam > GATE Questions > In a database system, unique time stamps are ...
Start Learning for Free
In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1 and T2 respectively. Besides, T1 holds a lock on the resource R, and T2 has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.
if TS(T2) < TS(T1) then
T1 is killed
else T2 waits.
Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?
if TS(T2) < TS(T1) then
T1 is killed
else T2 waits.
Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?
- a)The database system is both deadlock-free and starvation- free.
- b)The database system is deadlock-free, but not starvation-free.
- c)The database system is starvation-free but not deadlock-free.
- d)The database system is neither deadlock-free nor starvation-free.
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
In a database system, unique time stamps are assigned to each transact...
Given,
if TS(T2) <TS(T1) then
T1 is killed
else T2 waits.
if TS(T2) <TS(T1) then
T1 is killed
else T2 waits.
- T1 holds a lock on the resource R
- T2 has requested a conflicting lock on the same resource R
According to algo, TS(T2) <TS(T1) then T1 is killed else T2 will wait. So in both cases neither deadlock will happen nor starvation.
Therefore, option A is correct
Therefore, option A is correct
Most Upvoted Answer
In a database system, unique time stamps are assigned to each transact...
Timestamps. Lamport timestamps are a way to order events in a distributed system, ensuring that each event is assigned a unique timestamp that reflects its causality. The Lamport timestamp algorithm was proposed by Leslie Lamport in 1978.
In a database system, Lamport timestamps can be used to track the order of transactions. Each transaction is assigned a unique timestamp, which is typically a combination of the Lamport timestamp and a process identifier. The Lamport timestamp is incremented whenever a transaction is initiated, ensuring that each transaction has a higher timestamp than any previous transaction.
By using Lamport timestamps, the system can determine the order in which transactions occurred, even in a distributed environment where events may happen concurrently across multiple processes. This is important for maintaining consistency and enforcing constraints in the database.
Lamport timestamps have the property that if event A happened before event B, then the timestamp of A is less than the timestamp of B. However, the reverse is not necessarily true. Two events with different timestamps may have occurred concurrently and their order cannot be determined solely based on their timestamps. Therefore, Lamport timestamps are not used to enforce strict ordering of events, but rather to establish a partial ordering that reflects causality.
Overall, Lamport timestamps are a useful mechanism for assigning unique time stamps to transactions in a database system, allowing for the tracking and ordering of events in a distributed environment.
In a database system, Lamport timestamps can be used to track the order of transactions. Each transaction is assigned a unique timestamp, which is typically a combination of the Lamport timestamp and a process identifier. The Lamport timestamp is incremented whenever a transaction is initiated, ensuring that each transaction has a higher timestamp than any previous transaction.
By using Lamport timestamps, the system can determine the order in which transactions occurred, even in a distributed environment where events may happen concurrently across multiple processes. This is important for maintaining consistency and enforcing constraints in the database.
Lamport timestamps have the property that if event A happened before event B, then the timestamp of A is less than the timestamp of B. However, the reverse is not necessarily true. Two events with different timestamps may have occurred concurrently and their order cannot be determined solely based on their timestamps. Therefore, Lamport timestamps are not used to enforce strict ordering of events, but rather to establish a partial ordering that reflects causality.
Overall, Lamport timestamps are a useful mechanism for assigning unique time stamps to transactions in a database system, allowing for the tracking and ordering of events in a distributed environment.
|
Explore Courses for GATE exam
|
|
In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer?
Question Description
In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer?.
In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer?.
Solutions for In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for GATE.
Download more important topics, notes, lectures and mock test series for GATE Exam by signing up for free.
Here you can find the meaning of In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer?, a detailed solution for In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice In a database system, unique time stamps are assigned to each transaction using Lamport’s logical clock. Let TS(T1) and TS(T2) be the timestamps of transactions T1and T2respectively. Besides, T1holds a lock on the resource R, and T2has requested a conflicting lock on the same resource R. The following algorithm is used to prevent deadlocks in the database system assuming that a killed transaction is restarted with the same timestamp.if TS(T2) < TS(T1) thenT1is killedelse T2waits.Assume any transactions that is not killed terminates eventually. Which of the following is TRUE about the database system that uses the above algorithm to prevent deadlocks?a)The database system is both deadlock-free and starvation- free.b)The database system is deadlock-free, but not starvation-free.c)The database system is starvation-free but not deadlock-free.d)The database system is neither deadlock-free nor starvation-free.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice GATE tests.
|
|
Explore Courses for GATE exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup