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Module 8: Fault Tolerance and Dependability

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Module 8: Fault Tolerance and Dependability

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Questions and Answers

What is the primary concern in transactional dependability?

Maintaining speed and efficiency of transactions

Preventing communication failures

Ensuring atomicity and durability properties of transactions (correct)

Reducing the number of transaction aborts

What happens when a site failure occurs in a distributed transaction?

The other sites abort the transaction

The transaction is paused until the site recovers

The entire transaction is rolled back

The main memory contents are lost, but secondary storage contents are safe (correct)

What is the purpose of commit protocols in distributed transactions?

To execute the commit command for distributed transactions (correct)

To ensure that all sites abort the transaction

To prevent communication failures

To reduce the number of transaction aborts

What is a common consequence of communication failures in distributed transactions?

Transaction abort (A) Signup and view all the answers

What is the primary goal of termination protocols?

To deal with failures that occur during transaction execution (D) Signup and view all the answers

What is a possible outcome of a transaction abort?

The transaction is rolled back (D) Signup and view all the answers

What is a potential consequence of a head crash or controller failure?

The stored data is lost (B) Signup and view all the answers

What is the average percentage of transactions that abort abnormally?

3% (B) Signup and view all the answers

What is a type of failure that can occur in a distributed transaction?

All of the above (D) Signup and view all the answers

What is the purpose of RPC and RMI semantics in the presence of failures?

To mask communication failures (D) Signup and view all the answers