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Welcome to the Concurrency Control MCQs Page

Dive deep into the fascinating world of Concurrency Control with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Concurrency Control, a crucial aspect of DBMS. In this section, you will encounter a diverse range of MCQs that cover various aspects of Concurrency Control, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within DBMS.

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Check out the MCQs below to embark on an enriching journey through Concurrency Control. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of DBMS.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Concurrency Control. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Concurrency Control MCQs | Page 5 of 15

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Q41.
State true or false: Wait die scheme is a non-preemptive technique

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q42.
Lock timeouts have which of the following advantages?

a.

Unnecessary rollbacks do not occur

b.

Transactions do not starve

c.

It is easy to implement

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q43.
The _________ graph describes deadlocks precisely

a.

Wound wait graph

b.

Wait die graph

c.

Wait for graph

d.

None of the mentioned

Discuss
Answer: (c).Wait for graph
Q44.
How do we generally recover from a deadlock?

a.

By aborting all the transactions

b.

By rolling back all the transactions

c.

By rolling back only a selected number of transactions

d.

None of the mentioned

Discuss
Answer: (c).By rolling back only a selected number of transactions
Q45.
State true or false: Partial rollback is not possible.

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (b).False
Q46.
Which of the following steps must be taken while choosing a victim?

a.

Avoiding starvation

b.

Number of transactions involved in rollback

c.

Data items used by the transaction

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q47.
Which of the following cannot be used to implement a timestamp

a.

System clock

b.

Logical counter

c.

External time counter

d.

None of the mentioned

Discuss
Answer: (c).External time counter
Q48.
A logical counter is _________ after a new timestamp has been assigned

a.

Incremented

b.

Decremented

c.

Doubled

d.

Remains the same

Discuss
Answer: (a).Incremented
Q49.
W-timestamp(Q) denotes?

a.

The largest timestamp of any transaction that can execute write(Q) successfully

b.

The largest timestamp of any transaction that can execute read(Q) successfully

c.

The smallest timestamp of any transaction that can execute write(Q) successfully

d.

The smallest timestamp of any transaction that can execute read(Q) successfully

Discuss
Answer: (a).The largest timestamp of any transaction that can execute write(Q) successfully
Q50.
R-timestamp(Q) denotes?

a.

The largest timestamp of any transaction that can execute write(Q) successfully

b.

The largest timestamp of any transaction that can execute read(Q) successfully

c.

The smallest timestamp of any transaction that can execute write(Q) successfully

d.

The smallest timestamp of any transaction that can execute read(Q) successfully

Discuss
Answer: (b).The largest timestamp of any transaction that can execute read(Q) successfully
Page 5 of 15

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