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Chapter 19: Problem 31

Choose the correct answer for each of the following multiple-choice questions: For incremental logging with immediate updates, a log record for a transaction would contain: a. a transaction name, data item name, old value of item, new value of item. b. a transaction name, data item name, old value of item. c. a transaction name, data item name, new value of item. d. a transaction name and a data item name.

Short Answer

Expert verified
The correct answer is a. transaction name, data item name, old value of item, new value of item.

Step by step solution

01

Understand Incremental Logging

Incremental logging depicts the changes made by a transaction during its execution and logs such changes immediately as the transaction progresses. It includes old values and new values as well, so that it can facilitate the recovery process in case of a failure.
02

Evaluate Each Option

Evaluate each option in light of the understanding of incremental logging. Options (b), (c), and (d) can be eliminated because they don't include both old value and new value of a data item, which is necessary for incremental logging with immediate updates. Thus, option (a) will be the correct answer.
03

Identify the Correct Answer

So, for incremental logging with immediate updates, a log record for a transaction would contain a.transaction name, data item name, old value of item, new value of item.

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Most popular questions from this chapter

Discuss the UNDO and REDO operations and the recovery techniques that use each.

What do the terms steal/no-steal and force/no-force mean with regard to buffer management for transaction processing.

(Review from Chapter 17 ) What is the system log used for? What are the typical kinds of entries in a system log? What are checkpoints, and why are they important? What are transaction commit points, and why are they important?

Discuss the different types of transaction failures. What is meant by catastrophic failure?

Choose the correct answer for each of the following multiple-choice questions:Incremental logging with deferred updates implies that the recovery system must necessarily a. store the old value of the updated item in the log. b. store the new value of the updated item in the log. c. store both the old and new value of the updated item in the log. d. store only the Begin Transaction and Commit Transaction records in the log.
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