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DBMS Objective Questions and Answers

Practice DBMS objective questions with answers and detailed explanations. Covers normalization, transactions, indexing, SQL, concurrency control, recovery, and query optimization.

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.

16.
Which SQL command is DDL?
Easy
17.
Which join returns unmatched rows from the left table?
Medium
18.
Which problem is addressed by multiversion concurrency control?
High
19.
What is the main disadvantage of bitmap indexes?
Medium
20.
Which SQL clause filters grouped data?
Medium
21.
Which failure requires redo during recovery?
High
22.
Which key uniquely identifies a tuple?
Medium
23.
Which join produces maximum number of rows?
Medium
24.
Which schedule avoids cascading rollback?
High
25.
Which index is automatically created with primary key?
Medium
26.
Which SQL function returns NULL if input is NULL?
Medium
27.
Which normal form removes multivalued dependency?
High
28.
Which problem occurs when two transactions update same data simultaneously?
Medium
29.
Which clause is mandatory with GROUP BY?
Medium
30.
Which optimizer uses statistics to choose execution plans?
High
Answered: 0 / 15

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