Rigorous Rdbms Test - 66+ MCQs: RDBMS test: Evaluate Your Database Management Knowledge with RDBMS Questions and Answers

1. In the context of databases, what is a cursor?

A group of related data

A virtual table based on the result of a SELECT statement

A pointer used to iterate over a set of rows

An ordered list of values with corresponding row locations

2. In database terms, what does ACID stand for?

All Columns Indexed and Defined

Atomicity, Consistency, Isolation, Durability

Advanced Constraints and Index Definitions

Aggregate, Combine, Insert, Delete

3. What does the acronym SQL stand for?

Structured Question Language

System Query Language

Sequential Query Language

Structured Query Language

4. What is the purpose of the LIKE operator in SQL?

To filter rows based on a condition

To perform pattern matching in a WHERE clause

To sort the result set

To group rows based on a condition

5. Discuss the advantages and disadvantages of using database triggers.

Advantages: Automated actions in response to events, improved data integrity. Disadvantages: Increased complexity, potential performance overhead.

Advantages: Simplicity, reduced chances of errors. Disadvantages: Limited functionality, lack of flexibility.

Advantages: Improved query performance, enhanced security. Disadvantages: Limited event handling, increased development time.

Advantages: Increased data redundancy, reduced security risks. Disadvantages: Limited control over data changes, potential for errors.

6. What is the purpose of the ORDER BY clause in SQL?

To filter rows based on a condition

To sort the result set

To group rows based on a condition

To perform mathematical calculations on numeric columns

7. What is the purpose of the DISTINCT keyword in a SELECT statement?

To filter rows based on a condition

To sort the result set

To remove duplicate rows from the result set

To group rows based on a condition

8. Examine the role of the EXPLAIN statement in SQL and how it can be used to optimize queries.

The EXPLAIN statement provides insight into the query execution plan, allowing database administrators to analyze and optimize query performance.

The EXPLAIN statement is used to execute queries and has no impact on optimization.

The EXPLAIN statement is only relevant for simple queries and has limited impact on optimization.

The EXPLAIN statement is used to retrieve data from multiple tables but does not affect query performance.

9. What is the purpose of the JOIN operation in SQL?

To filter rows based on a condition

To combine rows from two or more tables based on a related column

To sort the result set

To group rows based on a condition

10. What does the term 'Index' refer to in the context of databases?

A group of related data

A collection of SQL statements

An ordered list of values with corresponding row locations

A constraint that ensures data integrity

11. Examine the purpose of the GROUPING SETS clause in SQL and how it differs from the GROUP BY clause.

GROUPING SETS allows grouping of data based on multiple columns or expressions, providing a more flexible grouping mechanism than GROUP BY.

GROUPING SETS and GROUP BY are interchangeable in SQL.

GROUPING SETS is only used for sorting data, while GROUP BY is used for grouping.

GROUPING SETS and GROUP BY have no impact on query performance.

12. What does SQL stand for in the context of databases?

Structured Query Language

System Query Language

Sequential Query Language

Standardized Query Language

13. In a relational database, what is a stored procedure?

A group of related data

A precompiled collection of one or more SQL statements

An index created on a specific column

A constraint that ensures uniqueness

14. What does the term 'Normalization' refer to in the context of databases?

Optimizing query performance

Reducing redundancy and dependency

Increasing data redundancy

Enhancing data encryption

15. Which SQL statement is used to delete data from a database?

REMOVE FROM

DELETE

ERASE

DROP

16. What is the purpose of the ROLLBACK statement in SQL?

To filter rows based on a condition

To undo changes made during the current transaction

To commit changes made during the current transaction

To sort the result set

17. Discuss the concept of database sharding and its application in distributed database systems.

Sharding involves breaking a large database into smaller, more manageable pieces called shards. It enhances scalability and performance in distributed database systems.

Sharding is a technique to create backup copies of a database. It is not suitable for distributed systems.

Sharding increases data redundancy and dependency in a distributed database.

Sharding is only applicable to single-node databases and has no relevance in distributed systems.

18. What is the purpose of the GROUP BY clause in SQL?

To filter rows based on a condition

To sort the result set

To group rows that have the same values in specified columns

To perform mathematical calculations on numeric columns

19. What does CRUD stand for in the context of databases?

Create, Retrieve, Update, Delete

Compile, Run, Update, Debug

Copy, Remove, Undo, Delete

Categorize, Revert, Update, Debug

20. Explain the concept of database normalization and its importance in database design.

Normalization is the process of reducing data redundancy and dependency in a database. It ensures efficient storage and avoids update anomalies.

Normalization involves adding redundancy to improve query performance in a database. It is not crucial for database design.

Normalization is a technique to increase data redundancy for faster retrieval.

Normalization is the process of creating duplicate data for backup purposes in a database.

21. Examine the role of stored procedures in a database and provide examples of situations where they offer advantages.

Stored procedures are precompiled sets of one or more SQL statements stored in a database. They offer advantages such as improved performance, reduced network traffic, and enhanced security.

Stored procedures are only useful for simple queries and have no impact on performance in a database.

Stored procedures increase network traffic and introduce security risks in a database.

Stored procedures are useful for data encryption but have no impact on query performance.

22. What is the purpose of the LIMIT clause in SQL?

To filter rows based on a condition

To limit the number of rows returned in the result set

To group rows based on a condition

To sort the result set

23. Compare and contrast the concepts of ACID and BASE in the context of database transactions.

ACID (Atomicity, Consistency, Isolation, Durability) ensures reliable and secure transactions. BASE (Basically Available, Soft state, Eventually consistent) prioritizes availability and responsiveness.

ACID and BASE are interchangeable terms describing the same principles of database transactions.

ACID and BASE are unrelated concepts in database transactions.

ACID and BASE both prioritize availability and responsiveness in database transactions.

24. Define the concept of database materialized views and situations where they can be advantageous.

Materialized views are precomputed snapshots of query results stored in the database. They offer advantages such as improved query performance and reduced load on the database.

Materialized views have no impact on query performance and should be avoided.

Materialized views are only suitable for small-scale databases with simple queries.

Materialized views are used to increase data redundancy and dependency in a database.

25. In the context of databases, what is a transaction?

A group of related data

A set of SQL statements executed as a single unit of work

An index created on a specific column

A constraint that ensures data integrity

26. Which SQL statement is used to revoke previously granted privileges on a database object?

REVOKE

DENY

REMOVE PRIVILEGES

DISALLOW ACCESS

27. Which SQL clause is used to filter the results of a SELECT statement?

ORDER BY

GROUP BY

WHERE

HAVING

28. What is the purpose of the COMMIT statement in SQL?

To filter rows based on a condition

To undo changes made during the current transaction

To commit changes made during the current transaction

To sort the result set

29. What is the purpose of the TRUNCATE statement in SQL?

To filter rows based on a condition

To remove all data from a table

To commit changes made during the current transaction

To sort the result set

30. What is the purpose of the ROW_NUMBER() function in SQL?

To filter rows based on a condition

To assign a unique number to each row within a partition

To sort the result set

To group rows based on a condition

31. Which of the following is an example of a DDL (Data Definition Language) statement?

SELECT

UPDATE

DELETE

CREATE TABLE

32. In a relational database, what is a foreign key?

A column that uniquely identifies each row in a table

A column that links to another table's primary key

A column that allows NULL values

A column with a default value

33. Which SQL statement is used to add a new column to an existing table?

ADD COLUMN

ALTER TABLE

INSERT INTO

CREATE COLUMN

34. In the context of databases, what is a stored function?

A group of related data

A precompiled collection of one or more SQL statements

A user-defined operation that returns a single value

An ordered list of values with corresponding row locations

35. In the context of databases, what is a subquery?

A precompiled collection of one or more SQL statements

An event that automatically invokes an action

A query nested within another query

An index created on a specific column

36. Which normalization form ensures that there are no repeating groups of data?

First Normal Form (1NF)

Second Normal Form (2NF)

Third Normal Form (3NF)

Fourth Normal Form (4NF)

37. What is the purpose of the HAVING clause in SQL?

To filter rows based on a condition

To sort the result set

To group rows based on a condition

To filter the result set after grouping

38. Which of the following is not a primary key constraint?

UNIQUE

NULL

PRIMARY

FOREIGN KEY

39. Define the concept of a NoSQL database and provide examples of scenarios where it might be more suitable than a traditional RDBMS.

NoSQL databases are non-relational databases designed for flexible and scalable data storage. They are suitable for scenarios with large volumes of unstructured or semi-structured data, high scalability requirements, and dynamic schemas.

NoSQL databases are only suitable for small-scale applications with structured data.

NoSQL databases have limited scalability compared to traditional RDBMS.

NoSQL databases are primarily designed for strict consistency and are unsuitable for scenarios with dynamic data.

40. Explain the concept of multi-version concurrency control (MVCC) in the context of database transactions.

MVCC allows multiple versions of the same data to coexist, enabling concurrent transactions without blocking. It ensures consistency and isolation in database transactions.

MVCC has no impact on concurrency control in database transactions.

MVCC only applies to single-node databases and is irrelevant in distributed systems.

MVCC increases data redundancy and dependency in a database.

RDBMS MCQ Test 2