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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 13 of 15

Q121.
Evaluate the following CREATE SEQUENCE statement:

CREATE SEQUENCE seq1
START WITH 100
INCREMENT BY 10
MAXVALUE 200
CYCLE
NOCACHE;

The sequence SEQ1 has generated numbers up to the maximum limit of 200. You issue the following SQL statement:

SELECT seq1.nextval FROM dual;

What is displayed by the SELECT statement?
Discuss
Answer: (a).1
Q122.
The method of access that uses key transformation is called as
Discuss
Answer: (b).Hash
Discuss
Answer: (c).To maintain accuracy of index
Q124.
How many techniques are available to control concurrency on B+ trees?
Discuss
Answer: (d).None of the mentioned
Discuss
Answer: (a).Goes down the tree and back up
Discuss
Answer: (b).Restarting the search after releasing the lock
Q127.
In crabbing protocol the the lock obtained on the root node is in _________ mode.
Discuss
Answer: (a).Shared
Q128.
If needed to split a node or coalesce it with its siblings, or redistribute key values between siblings, the crabbing protocol locks the parent of the node in ____________ mode.
Discuss
Answer: (b).Exclusive
Q129.
In crabbing protocol to inset or delete a key value the leaf node has to be locked in ___________ mode.
Discuss
Answer: (b).Exclusive
Q130.
B-link tree requires a pointer to its __________ sibling.
Discuss
Answer: (c).Right

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