Database Management Systems MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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What does the ‘ROLLBACK’ command do in SQL?
A. Undoes changes made during a transaction
B. Deletes all records from a table
C. Closes the database
D. Commits a transaction
Answer: Undoes changes made during a transaction
Which type of database management system allows the use of both SQL and NoSQL?
A. Multi-model database
B. Hierarchical database
C. Distributed database
D. Flat-file database
Answer: Multi-model database
What is ‘referential integrity’ in databases?
A. A condition where foreign key values correspond to primary key values
B. A method to encrypt data
C. A process to normalize the database
D. A way to back up a database
Answer: A condition where foreign key values correspond to primary key values
Which of the following is an aggregate function in SQL?
A. SUM()
B. JOIN
C. INSERT
D. DELETE
Answer: SUM()
What is a ‘distributed database’?
A. A database that is spread across multiple locations
B. A database that is stored on one server
C. A backup copy of a database
D. A type of non-relational database
Answer: A database that is spread across multiple locations
What is ‘OLTP’ in database systems?
A. Online Transaction Processing
B. Object Linked Transaction Protocol
C. Offline Transaction Processing
D. Online Link Table Processing
Answer: Online Transaction Processing
What does ‘BCNF’ stand for in database normalization?
A. Boyce-Codd Normal Form
B. Basic Composite Normal Form
C. Binary Control Normal Form
D. Base Cardinality Normal Form
Answer: Boyce-Codd Normal Form
What is ‘denormalization’ in databases?
A. The process of increasing redundancy for performance optimization
B. A process to normalize tables
C. A method to remove duplicate records
D. A way to delete rows
Answer: The process of increasing redundancy for performance optimization
What is a ‘clustered index’ in a database?
A. An index where the order of rows in the table corresponds to the index order
B. An index that allows duplicate values
C. An index used to group tables
D. An index created using multiple keys
Answer: An index where the order of rows in the table corresponds to the index order