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Chapter 19: Problem 36

Choose the correct answer for each of the following multiple-choice questions: To cope with media (disk) failures, it is necessary a. for the DBMS to only execute transactions in a single user environment. b. to keep a redundant copy of the database. c. to never abort a transaction. d. all of the above.

Short Answer

Expert verified
The correct answer to the question is option B: to keep a redundant copy of the database.

Step by step solution

01

Explanation and Evaluation of Option A

Option A suggests that handling disk failures requires the DBMS to only execute transactions in a single user environment. While limiting the number of users could simplify management issues, it would not inherently guard against disk failures. Therefore, option A does not offer an appropriate solution to the problem statement.
02

Explanation and Evaluation of Option B

Option B suggests maintaining a redundant copy of the database to cope with disk failures. This solution indeed offers an effective way to ensure data integrity in the event of a failure. When a disk with the primary data fails, the system can resort to the redundant copy. Therefore, option B is a valid solution.
03

Explanation and Evaluation of Option C

Option C proposes to never abort a transaction. However, not aborting a transaction would not guarantee the database's protection from disk failures. In some cases, it might be necessary to abort transactions to maintain data integrity. Therefore, option C is not an accurate solution.
04

Explanation and Evaluation of Option D

Option D suggests that all the above solutions are necessary. However, we have already determined that options A and C are not appropriate solutions. Therefore, option D is also not correct.

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Most popular questions from this chapter

(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?

What implications would a no-steal/force buffer management policy have on checkpointing and recovery?

Describe the shadow paging recovery technique. Under what circumstances does it not require a log?

How are buffering and caching techniques used by the recovery subsystem?

Choose the correct answer for each of the following multiple-choice questions: When using a log based recovery scheme, it might improve performance as well as providing a recovery mechanism by a. writing the log records to disk when each transaction commits. b. writing the appropriate log records to disk during the transaction's execution. c. waiting to write the log records until multiple transactions commit and writing them as a batch. d. never writing the log records to disk.
See all solutions

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