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Chapter 19: Problem 32

Choose the correct answer for each of the following multiple-choice questions: For correct behavior during recovery, undo and redo operations must be a. commutative. b. associative. c. idempotent. d. distributive.

Short Answer

Expert verified
The correct answer is c. idempotent.

Step by step solution

01

Understand the Meaning of The Options

Before choosing the correct option, you should first understand the meaning of each term. Commutative means changing the order of operations does not change the result, associative means regrouping does not change the result, idempotent means repeating the operation does not change the result, and distributive means one operation can be distributed over another.
02

Analyze the Properties of Undo and Redo Operations

Undo and redo operations should be reversible, meaning that they should result in the original state of the data when performed again. Additionally, performing them multiple times should result in the same state of the data.
03

Choose the Correct Answer

With the knowledge from the previous steps, we can infer that the answer is c. idempotent. The recovery operations, both undo and redo, should be idempotent in behavior.

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Most popular questions from this chapter

How can recovery handle transaction operations that do not affect the database, such as the printing of reports by a transaction?

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