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DBMS Buffer Replacement Strategies MCQs

DBMS Buffer Replacement Strategies MCQs: This section contains multiple-choice questions and answers on Buffer Replacement Strategies in DBMS.
Submitted by Anushree Goswami, on May 06, 2022

1. During buffer replacement, existing blocks are replaced with the ___ blocks in the buffer.

1. Old
2. New
3. Same
4. None

Answer: B) New

Explanation:

During buffer replacement, existing blocks are replaced with the new blocks in the buffer.

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2. How many strategies does Buffer Manager use for Buffer Replacement?

1. 2
2. 3
3. 4
4. 5

Answer: B) 3

Explanation:

There are 3 strategies does Buffer Manager used for Buffer Replacement.

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3. Which of the following does the Buffer Manager use for Buffer Replacement?

1. Least Recently Used Strategy
2. Toss-Immediate Strategy
3. Most-Recently Used Strategy
4. All of the above

Answer: D) All of the above

Explanation:

The Buffer Manager uses the following strategies for Buffer Replacement -

1. Least Recently Used Strategy
2. Toss-Immediate Strategy
3. Most-Recently Used Strategy

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4. Data or processes with the ____ score in their most recent use is replaced with the new data or processes.

1. Highest
2. Lowest
3. Average
4. None

Answer: B) Lowest

Explanation:

Data or processes with the lowest score in their most recent use are replaced with the new data or processes.

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5. ____-replacement strategy replaces the most recently referenced ____ if an existing ____ needs to be replaced.

1. Buffer
2. Block
3. Both A and B
4. None of the above

Answer: B) Block

Explanation:

Block-replacement strategy replaces the most recently referenced block if an existing block needs to be replaced.

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6. In the _____ strategy, the buffer manager should be instructed before processing of the final result, when the space occupied by a specific block is freed.

1. Least-used
2. Toss-immediate
3. Most-used
4. None

Answer: B) Toss-immediate

Explanation:

In the toss-immediate strategy, the buffer manager should be instructed before processing of the final result, when the space occupied by a specific block is freed.

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7. ____ replaces recent data or processes with the existing ones with the data or processes with the highest scores.

1. LRU
2. TI
3. MRU
4. None

Answer: C) MRU

Explanation:

MRU replaces recent data or processes with the existing ones with the data or processes with the highest scores.

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8. The choice of the appropriate strategy is also affected by ___.

1. Data
2. Time
3. Money
4. Choice

Answer: B) Time

Explanation:

The choice of the appropriate strategy is also affected by time.

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9. Database systems may have to delay some requests if they receive ____ requests from different users, so they can preserve data consistency.

1. Consecutive
2. Simultaneous
3. Concurrent
4. None

Answer: C) Concurrent

Explanation:

Database systems may have to delay some requests if they receive concurrent requests from different users, so they can preserve data consistency.

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10. The buffer manager may ___ its strategies if it learns about the delayed requests.

1. Update
2. Modify
3. Add
4. Delete

Answer: B) Modify

Explanation:

The buffer manager may modify its strategies if it learns about the delayed requests.

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