What is the purpose of an index in a database? MCQ with Answer and Explanation

Question
What is the purpose of an index in a database?
A. To speed up data retrieval operations
B. To enforce foreign key constraints
C. To encrypt data
D. To compress data
Answer: Option A
Solution (By JKSSB Mock Tests)
Indexes are used to improve the speed of data retrieval queries, at the cost of additional storage and maintenance overhead.
This question belongs to: Computer Database Management System (DBMS)
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Practice More Database Management System (DBMS) Questions

Question #1
When the same data is updated in one location but remains unchanged in another location, it creates a state of what?
A. Data Integrity
B. Data Independence
C. Data Inconsistency
D. Data Security
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Correct Answer: Option C

Explanation:
Data Inconsistency occurs when different versions of the same data appear in different places due to uncontrolled data redundancy.
This question belongs to: Computer Database Management System (DBMS)
Question #2
What value represents missing, unknown, or inapplicable data in a relational database?
A. Zero (0)
B. NULL
C. Blank Space (' ')
D. Void
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Correct Answer: Option B

Explanation:
NULL is a special marker used in SQL to indicate the absence of a value or that the data is missing, unknown, or not applicable.
This question belongs to: Computer Database Management System (DBMS)
Question #3
What does DBMS stand for?
A. Database Management System
B. Digital Business Management Software
C. Data Backup Management System
D. Dynamic Binary Manipulation System
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Correct Answer: Option A

Explanation:
DBMS stands for Database Management System, which is software for creating and managing databases.
This question belongs to: Computer Database Management System (DBMS)
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