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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 1 of 15

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Q1.
Locks placed by command are called ________ .

a.

implicit locks

b.

explicit locks

c.

exclusive locks

d.

shared locks

Discuss
Answer: (b).explicit locks
Q2.
Which of the following locks the item from change but not from read?

a.

Implicit lock

b.

Explicit lock

c.

Exclusive lock

d.

Shared lock

Discuss
Answer: (d).Shared lock
Q3.
The advantage of optimistic locking is that:

a.

the lock is obtained only after the transaction has processed.

b.

the lock is obtained before the transaction has processed.

c.

the lock never needs to be obtained.

d.

transactions that are best suited are those with a lot of activity.

Discuss
Answer: (a).the lock is obtained only after the transaction has processed.
Q4.
Which of the following refers to a cursor type that when the cursor is opened, a primary key value is saved for each row in the recordset; when the application accesses a row, the key is used to fetch the current values of the row?

a.

Forward only

b.

Static

c.

Keyset

d.

Dynamic

Discuss
Answer: (c).Keyset
Q5.
Which of the following refers to a cursor type where changes of any type and from any source are visible?

a.

Forward only

b.

Static

c.

Keyset

d.

Dynamic

Discuss
Answer: (d).Dynamic
Q6.
Which of the following disallows both dirty reads and nonrepeatable reads, but allows phantom reads?

a.

Read committed

b.

Read uncommitted

c.

Repeatable read

d.

Serializable

Discuss
Answer: (c).Repeatable read
Q7.
Dirty read, nonrepeatable, and phantom reads are not possible in this instance.

a.

Read committed

b.

Read uncommitted

c.

Repeatable read

d.

Serializable

Discuss
Answer: (d).Serializable
Q8.
A transaction in which either all of the database actions occur or none of them do is called:

a.

atomic

b.

consistent

c.

isolated

d.

durable

Discuss
Answer: (a).atomic
Q9.
A cursor type in which the application can only move forward through the recordset is called:

a.

forward only

b.

static

c.

keyset

d.

dynamic

Discuss
Answer: (a).forward only
Q10.
Which of the following occurs when one transaction reads a changed record that has not been committed to the database?

a.

Nonrepeatable read

b.

Phantom read

c.

Dirty read

d.

Consistent read

Discuss
Answer: (c).Dirty read
Page 1 of 15

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