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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 8 of 15

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Q71.
Under ________ the system uses locking mechanism that applies only to updates

a.

First updater wins

b.

First committer wins

c.

First writer wins

d.

None of the mentioned

Discuss
Answer: (a).First updater wins
Q72.
The situation in which each pair of transactions has read a data written by the other, but there is no data written by the transactions is called as _______

a.

Deadlock

b.

Read skew

c.

Deadlock skew

d.

Write skew

Discuss
Answer: (d).Write skew
Q73.
Oracle uses __________ for the serializable isolation level

a.

Multiversion scheme

b.

Timestamp protocol

c.

Lock based protocol

d.

Snapshot isolation

Discuss
Answer: (d).Snapshot isolation
Q74.
State true or false: Snapshot isolation has low overhead

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q75.
In ________ no two aborts occur unless two concurrent transactions update the same data item.

a.

Multiversion scheme

b.

Timestamp protocol

c.

Lock based protocol

d.

Snapshot isolation

Discuss
Answer: (d).Snapshot isolation
Q76.
Which of the following transactions can multiversion two phase locking protocol not differentiate.

a.

Read only transactions

b.

Update transactions

c.

All of the mentioned

d.

Double operator transactions

Discuss
Answer: (d).Double operator transactions
Q77.
________ deletes a data item from a database

a.

Delete(Q)

b.

Insert(Q)

c.

Drop(Q)

d.

None of the mentioned

Discuss
Answer: (a).Delete(Q)
Q78.
Which of the following does not lock the entire index

a.

Phantom locking

b.

Phantom problem

c.

Index locking

d.

Index problem

Discuss
Answer: (c).Index locking
Q79.
Which of the following is included in the operational mechanism of the index locking protocol?

a.

Every transaction must have at least one index

b.

A transaction that performs a lookup must acquire a shared lock on all the index leaf nodes that it accesses

c.

The rule of the two phase locking mechanism must be observed

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q80.
_________ is a form of two degree consistency designed for programs that iterate over tuples of a relation by using cursors.

a.

Cursor stability

b.

Serializability

c.

Non-serializability

d.

Predicate locking

Discuss
Answer: (a).Cursor stability
Page 8 of 15

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