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Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:
Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.
Step 2. The required operations are performed.
Step 3. All locks are released. This protocol will
Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.
Step 2. The required operations are performed.
Step 3. All locks are released. This protocol will
- a)guarantee serializability and deadlock-freedom
- b)guarantee neither serializability nor deadlock-freedom
- c)guarantee serializability but not deadlock-freedom
- d)guarantee deadlock-freedom but not serializability
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Consider the following two phase locking protocol. Suppose a transacti...
The above scenario is Conservative 2PL(or Static 2PL). In Conservative 2PL protocol, a transaction has to lock all the items it access before the transaction begins execution. It is used to avoid deadlocks. Also, 2PL is conflict serializable, therefore it guarantees serializability. Therefore option A Advantages of Conservative 2PL :
- No possibility of deadlock.
- Ensure serializability.
Drawbacks of Conservative 2PL :
- Less throughput and resource utilisation because it holds the resources before the transaction begins execution.
- Starvation is possible since no restriction on unlock operation.
- 2pl is a deadlock free protocol but it is difficult to use in practice.
Most Upvoted Answer
Consider the following two phase locking protocol. Suppose a transacti...
Explanation:
Two-Phase Locking Protocol: It is a concurrency control mechanism that ensures serializability and prevents deadlocks. In this protocol, a transaction must acquire all the required locks before it can operate on the data items, and release all the locks once it has completed the operation.
Steps:
The two-phase locking protocol works in two phases:
Phase 1: Growing Phase
- The transaction acquires the locks on the required data items in increasing order of their addresses.
- Once a lock is acquired, it cannot be released until the transaction has completed its operation on that data item.
- In this phase, the transaction can only acquire locks, and cannot release any locks.
Phase 2: Shrinking Phase
- The transaction releases all the locks it has acquired in the reverse order of their acquisition.
- Once a lock is released, it cannot be acquired again.
Guarantee:
This protocol guarantees serializability and deadlock-freedom.
Serializability: The two-phase locking protocol ensures serializability by ensuring that conflicting transactions acquire locks in a mutually exclusive manner. This means that no two transactions can operate on the same data item at the same time.
Deadlock-freedom: The two-phase locking protocol prevents deadlocks by ensuring that a transaction cannot request a lock if it already holds a lock on another data item. This ensures that there can be no circular wait for locks, which is a necessary condition for deadlocks.
Therefore, option 'A' is the correct answer.
Two-Phase Locking Protocol: It is a concurrency control mechanism that ensures serializability and prevents deadlocks. In this protocol, a transaction must acquire all the required locks before it can operate on the data items, and release all the locks once it has completed the operation.
Steps:
The two-phase locking protocol works in two phases:
Phase 1: Growing Phase
- The transaction acquires the locks on the required data items in increasing order of their addresses.
- Once a lock is acquired, it cannot be released until the transaction has completed its operation on that data item.
- In this phase, the transaction can only acquire locks, and cannot release any locks.
Phase 2: Shrinking Phase
- The transaction releases all the locks it has acquired in the reverse order of their acquisition.
- Once a lock is released, it cannot be acquired again.
Guarantee:
This protocol guarantees serializability and deadlock-freedom.
Serializability: The two-phase locking protocol ensures serializability by ensuring that conflicting transactions acquire locks in a mutually exclusive manner. This means that no two transactions can operate on the same data item at the same time.
Deadlock-freedom: The two-phase locking protocol prevents deadlocks by ensuring that a transaction cannot request a lock if it already holds a lock on another data item. This ensures that there can be no circular wait for locks, which is a necessary condition for deadlocks.
Therefore, option 'A' is the correct answer.
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Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. Can you explain this answer?
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Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. 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 two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. 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 two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. Can you explain this answer?.
Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. 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 two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. 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 two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE).
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Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider the following two phase locking protocol. Suppose a transaction T accesses (for read or write operations), a certain set of objects {O1,...,Ok}. This is done in the following manner:Step 1. T acquires exclusive locks to O1, . . . , Ok in increasing order of their addresses.Step 2. The required operations are performed.Step 3. All locks are released. This protocol willa)guarantee serializability and deadlock-freedomb)guarantee neither serializability nor deadlock-freedomc)guarantee serializability but not deadlock-freedomd)guarantee deadlock-freedom but not serializabilityCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
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