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

Total Questions : 50
Expected Time : 50 Minutes

1. 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

2. 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

3. What does the term 'Concurrency Control' refer to in the context of databases?

Ensuring the accuracy and consistency of data

Optimizing query performance

Managing multiple transactions accessing the database simultaneously

Increasing data redundancy

4. Which SQL statement is used to add new data to a database?

INSERT INTO

CREATE

ADD

NEW DATA

5. Which of the following is an example of an INNER JOIN?

LEFT JOIN

OUTER JOIN

CROSS JOIN

EQUIJOIN

6. What is the purpose of the CASE statement in SQL?

To filter rows based on a condition

To perform conditional logic in a SELECT statement

To sort the result set

To group rows based on a condition

7. Which of the following is an example of an aggregate function in SQL?

JOIN

COUNT

WHERE

GROUP

8. 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

9. What is the purpose of the COALESCE function in SQL?

To filter rows based on a condition

To perform conditional logic in a SELECT statement

To return the first non-null expression in a list

To group rows based on a condition

10. 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

11. 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.

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

UNIQUE

NULL

PRIMARY

FOREIGN KEY

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

ORDER BY

GROUP BY

WHERE

HAVING

14. 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.

15. 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

16. Explain the concept of database indexing and its impact on query performance.

Indexing is the process of creating an ordered list of values with corresponding row locations, improving query performance by enabling faster data retrieval.

Indexing has no impact on query performance in a database.

Indexing slows down query performance by introducing additional overhead.

Indexing is only beneficial for read-only databases and has no impact on write operations.

17. Which SQL statement is used to update data in a database?

INSERT INTO

MODIFY

UPDATE

ALTER

18. 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.

19. 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.

20. In the context of databases, what is a database trigger?

A stored procedure

An event that automatically invokes an action

A constraint that ensures data integrity

A group of related data

21. 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.

22. 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.

23. 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

24. What is the purpose of the FOREIGN KEY constraint in a database?

Ensures uniqueness of a column

Defines a default value

Links a column to another table's primary key

Allows NULL values

25. 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

26. 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

27. Which of the following is a benefit of using stored procedures in a database?

Reduced network traffic

Increased data redundancy

Enhanced data encryption

Optimized query performance

28. 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

29. 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.

30. 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.

31. Which type of relationship is represented by a foreign key in a database?

One-to-Many

Many-to-Many

One-to-One

None of the above

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

REVOKE

DENY

REMOVE PRIVILEGES

DISALLOW ACCESS

33. 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

34. 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

35. Which of the following is an example of a database trigger?

A stored procedure

An event that automatically invokes an action

A constraint that ensures data integrity

A group of related data

36. What is the purpose of the PRIMARY KEY constraint in a database table?

Ensures uniqueness of a column

Allows NULL values

Specifies default values

Defines a foreign key

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

Structured Query Language

System Query Language

Sequential Query Language

Standardized Query Language

38. What is the purpose of the HAVING clause in SQL, and how is it different from the WHERE clause?

HAVING is used for filtering rows based on conditions, while WHERE is used for grouping rows.

HAVING is used for grouping rows, while WHERE is used for filtering rows based on conditions.

HAVING and WHERE are interchangeable in SQL.

HAVING is used for sorting rows, while WHERE is used for filtering rows based on conditions.

39. 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

40. What is the purpose of the CASCADE option in a foreign key constraint?

To filter rows based on a condition

To automatically delete or update related rows in the referenced table

To sort the result set

To group rows based on a condition

41. What does the acronym SQL stand for?

Structured Question Language

System Query Language

Sequential Query Language

Structured Query Language

42. Discuss the role of database partitioning and situations where it can improve performance.

Database partitioning involves dividing large tables into smaller, more manageable pieces. It can improve query performance by reducing the amount of data that needs to be processed.

Database partitioning is only applicable to small-scale databases and has no impact on performance.

Database partitioning increases data redundancy and dependency.

Database partitioning is useful for write-heavy workloads but does not affect query performance.

43. Discuss the concept of database denormalization and situations where it might be considered beneficial.

Denormalization involves intentionally introducing redundancy in a database to improve query performance. It may be considered beneficial in scenarios with complex queries and read-heavy workloads.

Denormalization is always detrimental to database performance and should be avoided.

Denormalization is only suitable for write-heavy workloads and has no impact on query performance.

Denormalization is a technique to remove all redundancy from a database, improving overall performance.

44. 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

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

REMOVE FROM

DELETE

ERASE

DROP

46. 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

47. 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

48. 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

49. 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

50. In the context of databases, what is a view?

A group of related data

A virtual table based on the result of a SELECT statement

A constraint that ensures uniqueness

An index created on a specific column

RDBMS MCQ Test 1