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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 11 of 15

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Q101.
If a node is locked in ____________ then explicit locking is being done at a lower level, with exclusive-mode or shared-mode locks.

a.

Intention lock modes

b.

Intention-shared-exclusive mode

c.

Intention-exclusive (IX) mode

d.

Intention-shared (IS) mode

Discuss
Answer: (c).Intention-exclusive (IX) mode
Q102.
If a node is locked in ______________ the subtree rooted by that node is locked explicitly in shared mode, and that explicit locking is being done at a lower level with exclusive-mode locks.

a.

Intention lock modes

b.

shared and intention-exclusive (SIX) mode

c.

Intention-exclusive (IX) mode

d.

Intention-shared (IS) mode

Discuss
Answer: (b).shared and intention-exclusive (SIX) mode
Q103.
____________ denotes the largest timestamp of any transaction that executed write(Q) successfully.

a.

W-timestamp(Q)

b.

R-timestamp(Q)

c.

RW-timestamp(Q)

d.

WR-timestamp(Q)

Discuss
Answer: (a).W-timestamp(Q)
Q104.
The _____________ ensures that any conflicting read and write operations are executed in timestamp order.

a.

Timestamp-ordering protocol

b.

Timestamp protocol

c.

W-timestamp

d.

R-timestamp

Discuss
Answer: (a).Timestamp-ordering protocol
Q105.
The __________ requires that each transaction Ti executes in two or three different phases in its lifetime, depending on whether it is a read-only or an update transaction.

a.

Validation protocol

b.

Validation-based protocol

c.

Timestamp protocol

d.

Timestamp-ordering protocol

Discuss
Answer: (a).Validation protocol
Q106.
This validation scheme is called the _________ scheme since transactions execute optimistically, assuming they will be able to finish execution and validate at the end.

a.

Validation protocol

b.

Validation-based protocol

c.

Timestamp protocol

d.

Optimistic concurrency-control

Discuss
Answer: (a).Validation protocol
Q107.
The most recent version of standard SQL prescribed by the American National Standards Institute is

a.

SQL 2011

b.

SQL 2002

c.

SQL – 4

d.

SQL2

Discuss
Answer: (a).SQL 2011
Q108.
ANSI-standard SQL allows the use of special operators in conjunction with the WHERE clause. A special operator used to check whether an attribute value is null is

a.

BETWEEN

b.

IS NULL

c.

LIKE

d.

IN

Discuss
Answer: (b).IS NULL
Q109.
A lock that prevents the use of any tables in the database from one transaction while another transaction is being processed is called a

a.

Database-level lock

b.

Table-level lock

c.

Page-level lock

d.

Row-level lock

Discuss
Answer: (a).Database-level lock
Q110.
A condition that occurs when two transactions wait for each other to unlock data is known as a(n)

a.

Shared lock

b.

Exclusive lock

c.

Binary lock

d.

Deadlock

Discuss
Answer: (a).Shared lock
Page 11 of 15

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