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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 6 of 15

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Q51.
A ________ ensures that any conflicting read and write operations are executed in timestamp order

a.

Organizational protocol

b.

Timestamp ordering protocol

c.

Timestamp execution protocol

d.

802-11 protocol

Discuss
Answer: (b).Timestamp ordering protocol
Q52.
The default timestamp ordering protocol generates schedules that are

a.

Recoverable

b.

Non-recoverable

c.

Starving

d.

None of the mentioned

Discuss
Answer: (b).Non-recoverable
Q53.
State true or false: The Thomas write rule has a greater potential concurrency than the timestamp ordering protocol

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q54.
Which of the following timestamp based protocols generates serializable schedules?

a.

Thomas write rule

b.

Timestamp ordering protocol

c.

Validation protocol

d.

None of the mentioned

Discuss
Answer: (a).Thomas write rule
Q55.
In timestamp ordering protocol, suppose that the transaction Ti issues read(Q) and TS(Ti)<W-timestamp(Q), then

a.

Read operation is executed

b.

Read operation is rejected

c.

Write operation is executed

d.

Write operation is rejected

Discuss
Answer: (b).Read operation is rejected
Q56.
In timestamp ordering protocol, suppose that the transaction Ti issues write(Q) and TS(Ti)<W-timestamp(Q), then

a.

Read operation is executed

b.

Read operation is rejected

c.

Write operation is executed

d.

Write operation is rejected

Discuss
Answer: (d).Write operation is rejected
Q57.
The _________ requires each transaction executes in two or three different phases in its lifetime

a.

Validation protocol

b.

Timestamp protocol

c.

Deadlock protocol

d.

View protocol

Discuss
Answer: (a).Validation protocol
Q58.
During __________ phase, the system reads data and stores them in variables local to the transaction.

a.

Read phase

b.

Validation phase

c.

Write phase

d.

None of the mentioned

Discuss
Answer: (a).Read phase
Q59.
During the _________ phase the validation test is applied to the transaction

a.

Read phase

b.

Validation phase

c.

Write phase

d.

None of the mentioned

Discuss
Answer: (b).Validation phase
Q60.
During the _______ phase, the local variables that hold the write operations are copied to the database

a.

Read phase

b.

Validation phase

c.

Write phase

d.

None of the mentioned

Discuss
Answer: (c).Write phase
Page 6 of 15

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