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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 9 of 15

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Q81.
Transactions that involve user interactions are called __________

a.

Validations

b.

Conversations

c.

Interfaces

d.

None of the mentioned

Discuss
Answer: (b).Conversations
Q82.
State true or false: Key value locking provides increased concurrency

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q83.
To prevent the phantom phenomenon, _______ is used

a.

Key value locking

b.

Next key locking

c.

Previous key locking

d.

None of the mentioned

Discuss
Answer: (b).Next key locking
Q84.
Which of the following does cursor stability ensure

a.

The tuple that is currently being processed by the iteration is locked in shared mode

b.

The tuple that is currently being processed is not locked in shared mode

c.

Any modified tuples are not locked in exclusive mode

d.

None of the mentioned

Discuss
Answer: (a).The tuple that is currently being processed by the iteration is locked in shared mode
Q85.
State true or false: Exclusive locks are held until transaction commit in degree two consistency

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q86.
In order to maintain transactional integrity and database consistency, what technology does a DBMS deploy?

a.

Triggers

b.

Pointers

c.

Locks

d.

Cursors

Discuss
Answer: (c).Locks
Q87.
Which of the following are introduced to reduce the overheads caused by the log-based recovery?

a.

Checkpoints

b.

Indices

c.

Deadlocks

d.

Locks

Discuss
Answer: (d).Locks
Q88.
Which of the following protocols ensures conflict serializability and safety from deadlocks?

a.

Two-phase locking protocol

b.

Time-stamp ordering protocol

c.

Graph based protocol

d.

None of the mentioned

Discuss
Answer: (b).Time-stamp ordering protocol
Q89.
Which of the following is the block that is not permitted to be written back to the disk?

a.

Dead code

b.

Read only

c.

Pinned

d.

Zapped

Discuss
Answer: (c).Pinned
Q90.
If transaction Ti gets an explicit lock on the file Fc in exclusive mode, then it has an__________ on all the records belonging to that file.

a.

Explicit lock in exclusive mode

b.

Implicit lock in shared mode

c.

Explicit lock in shared mode

d.

Implicit lock in exclusive mode

Discuss
Answer: (d).Implicit lock in exclusive mode
Page 9 of 15

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