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DBMS Objective Questions and Answers

This DBMS quiz contains carefully curated objective questions with correct answers and clear explanations. It is designed for computer science students, backend developers, and interview preparation, focusing on database design, SQL internals, transactions, indexing, and performance tuning.

Practice DBMS MCQs with Detailed Explanations

Answer at least 12 questions to submit.

1.
Easy
Which normal form eliminates transitive dependency?
2.
Medium
Which SQL clause is evaluated first in query execution?
3.
Medium
Which index structure is best suited for range queries?
4.
Medium
What anomaly is prevented by 2NF?
5.
Medium
Which isolation level allows dirty reads?
6.
High
Which schedule is conflict serializable?
7.
Medium
What is the main purpose of a checkpoint in recovery?
8.
Medium
Which join algorithm is most efficient when one relation fits entirely in memory?
9.
Medium
Which condition causes a deadlock?
10.
Medium
Which operation cannot be performed on a view without INSTEAD OF trigger?
11.
High
Which locking protocol guarantees conflict serializability?
12.
Medium
Which normal form is stricter than 3NF?
13.
Medium
What is the output of COUNT(column) when all values are NULL?
14.
Medium
Which index consumes the least storage?
15.
High
What does WAL ensure?
Answered: 0 / 15

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