DBMS MCQ QUESTIONS MODEL PAPER – 8

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DBMS MCQ QUESTIONS MODEL PAPER – 8

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 1. What is a "view" in the context of a Database Management System (DBMS)?

a. A physical storage unit for data 

b. A virtual table based on the result of a SELECT query 

c. A primary key constraint on a table 

d. A unique identifier for a database record

 

Answer: b. A virtual table based on the result of a SELECT query

 

 2. In a DBMS, what is the primary purpose of creating views?

a. To store data permanently 

b. To improve data security 

c. To simplify complex queries and provide a customized presentation of data 

d. To enforce referential integrity

 

Answer: c. To simplify complex queries and provide a customized presentation of data

 

 3. Which of the following statements about views in a DBMS is true?

a. Views are physical tables with actual data stored in them 

b. Views cannot be used in SQL queries 

c. Views are dynamic and reflect changes in the underlying data 

d. Views are primarily used for storing sensitive information

 

Answer: c. Views are dynamic and reflect changes in the underlying data

 

 4. What is a "materialized view" in a DBMS?

a. A view with physical data stored in it 

b. A view that cannot be modified or queried 

c. A view that enforces constraints on data 

d. A view without any SELECT statement

 

Answer: a. A view with physical data stored in it

 

 5. How does a view contribute to data abstraction in a DBMS?

a. By making data retrieval more complex 

b. By hiding the underlying complexity of data from users 

c. By limiting the types of queries that can be performed 

d. By reducing data security

 

Answer: b. By hiding the underlying complexity of data from users

 

 6. In a DBMS, what is the significance of the "WITH CHECK OPTION" clause when creating a view?

a. It allows users to check the integrity of the entire database 

b. It restricts data modification to rows that satisfy the view's defining condition 

c. It enforces a primary key constraint on the view 

d. It limits the number of rows displayed in the view

 

Answer: b. It restricts data modification to rows that satisfy the view's defining condition

 

 7. Which of the following is an advantage of using views in a DBMS?

a. Increased data redundancy 

b. Limited data security 

c. Simplified data access and reduced complexity for users 

d. Reduced data abstraction

 

Answer: c. Simplified data access and reduced complexity for users

 

 8. What is the primary difference between a view and a table in a DBMS?

a. Tables store virtual data, while views store physical data 

b. Views are permanent storage units, while tables are temporary 

c. Views are based on SELECT queries and do not store physical data, while tables store physical data 

d. Tables are used for complex queries, while views are used for simple queries

 

Answer: c. Views are based on SELECT queries and do not store physical data, while tables store physical data

 

 9. How does a view contribute to data security in a DBMS?

a. By exposing all data to users 

b. By restricting access to certain columns of a table 

c. By increasing data redundancy 

d. By preventing the use of SQL queries

 

Answer: b. By restricting access to certain columns of a table

 

 10. What is the role of the "CREATE VIEW" statement in a DBMS?

a. To create a physical table 

b. To create a virtual table based on a SELECT query 

c. To enforce constraints on a table 

d. To delete a table from the database

 

Answer: b. To create a virtual table based on a SELECT query

 

 11. What is the purpose of the "WITH CHECK OPTION" clause in a view definition in a DBMS?

a. To check the integrity of the entire database 

b. To enforce a primary key constraint on the view 

c. To limit the number of rows displayed in the view 

d. To restrict data modification to rows that satisfy the view's defining condition

 

Answer: d. To restrict data modification to rows that satisfy the view's defining condition

 

 12. Which of the following statements about materialized views is true?

a. Materialized views are dynamic and reflect changes in the underlying data 

b. Materialized views do not store physical data 

c. Materialized views are primarily used for data abstraction 

d. Materialized views are views without any SELECT statement

 

Answer: a. Materialized views are dynamic and reflect changes in the underlying data

 

 13. How does a view contribute to simplifying data access in a DBMS?

a. By making data retrieval more complex 

b. By exposing the underlying complexity of data to users 

c. By providing a customized presentation of data 

d. By increasing the number of tables in the database

 

Answer: c. By providing a customized presentation of data

 

 14. In a DBMS, what is the primary role of the "DROP VIEW" statement?

a. To create a view 

b. To delete a view from the database 

c. To modify the data in a view 

d. To enforce constraints on a view

 

Answer: b. To delete a view from the database

 

 15. What is the significance of the "INSTEAD OF" trigger in the context of views in a DBMS?

a. It prevents data modification in a view 

b. It enforces constraints on a view 

c. It provides an alternative mechanism for handling data modification operations on a view 

d. It limits the types of queries that can be performed on a view

 

Answer: c. It provides an alternative mechanism for handling data modification operations on a view

 

 16. Which of the following is a disadvantage of using views in a DBMS?

a. Increased data redundancy 

b. Limited data security 

c. Increased complexity for users 

d. Reduced data abstraction

 

Answer: c. Increased complexity for users

 

 17. What is the role of the "WITH READ ONLY" clause in the definition of a view in a DBMS?

a. To restrict data modification operations on the view 

b. To enforce referential integrity on the view 

c. To allow only read operations on the view 

d. To hide the view from certain users

 

Answer: c. To allow only read operations on the view

 

 18. How does a view enhance data independence in a DBMS?

a. By making data retrieval more complex 

b. By limiting the types of queries that can be performed 

c. By providing a layer of abstraction between users and the underlying data 

d. By exposing the underlying complexity of data to users

 

Answer: c. By providing a layer of abstraction between users and the underlying data

 

 19. What is a key benefit of using views for data reporting in a DBMS?

a. Views do not support data reporting 

b. Views provide a direct connection to the underlying data 

c. Views simplify the reporting process by presenting a tailored view of the data 

d. Views make the reporting process more complex

 

Answer: c. Views simplify the reporting process by presenting a tailored view of the data

 

 20. How does a materialized view differ from a regular (non-materialized) view in a DBMS?

a. Materialized views are not dynamic and do not reflect changes in the underlying data 

b. Regular views store physical data, while materialized views do not 

c. Materialized views do not support data abstraction 

d. Regular views are primarily used for data reporting

 

Answer: a. Materialized views are not dynamic and do not reflect changes in the underlying data

 

 21. What is the primary advantage of using a view in a DBMS for security purposes?

a. Views expose all data to users 

b. Views enforce referential integrity 

c. Views provide a layer of abstraction, allowing restricted access to specific columns and rows 

d. Views restrict the use of SQL queries

 

Answer: c. Views provide a layer of abstraction, allowing restricted access to specific columns and rows

 

 22. What is the purpose of the "CREATE OR REPLACE VIEW" statement in a DBMS?

a. To create a new table 

b. To modify the data in a view 

c. To create a view or update it if it already exists 

d. To enforce constraints on a view

 

Answer: c. To create a view or update it if it already exists

 

 23. Which of the following statements about the relationship between views and tables in a DBMS is true?

a. Views are independent of tables and do not rely on table data 

b. Views cannot be based on more than one table 

c. Views are directly linked to the underlying tables and reflect changes in table data 

d. Tables are virtual representations of views

 

Answer: c. Views are directly linked to the underlying tables and reflect changes in table data

 

 24. What is the significance of the "WITH CHECK OPTION" clause when modifying data through a view in a DBMS?

a. It allows unrestricted modification of data 

b. It enforces referential integrity on the view 

c. It restricts data modification to rows that satisfy the view's defining condition 

d. It limits the number of rows displayed in the view

 

Answer: c. It restricts data modification to rows that satisfy the view's defining condition

 

 25. In a DBMS, what is the role of an "INSTEAD OF" trigger associated with a view?

a. To prevent data modification in a view 

b. To enforce constraints on a view 

c. To provide an alternative mechanism for handling data modification operations on a view 

d. To limit the types of queries that can be performed on a view

 

Answer: c. To provide an alternative mechanism for handling data modification operations on a view

 

 26. How does a view contribute to data integrity in a DBMS?

a. By making data retrieval more complex 

b. By exposing the underlying complexity of data to users 

c. By providing a layer of abstraction between users and the underlying data 

d. By enforcing data constraints on the view

 

Answer: d. By enforcing data constraints on the view

 

 27. What is the role of the "WITH CASCADED CHECK OPTION" clause in a DBMS view definition?

a. To enforce referential integrity on the view 

b. To allow unrestricted data modification in the view 

c. To restrict data modification to rows that satisfy the view's defining condition 

d. To cascade the check option to related views

 

Answer: d. To cascade the check option to related views

 

 28. How does a view contribute to improving query performance in a DBMS?

a. By increasing data redundancy 

b. By limiting data retrieval operations 

c. By providing a layer of abstraction for complex queries 

d. By making the querying process more complex

 

Answer: c. By providing a layer of abstraction for complex queries

 

 29. What is the primary advantage of using a view for data reporting in a DBMS?

a. Views do not support data reporting 

b. Views provide a direct connection to the underlying data 

c. Views simplify the reporting process by presenting a tailored view of the data 

d. Views make the reporting process more complex

 

Answer: c. Views simplify the reporting process by presenting a tailored view of the data

 

 30. In a DBMS, what is the significance of the "WITH READ ONLY" clause when defining a view?

a. To allow only read operations on the view 

b. To restrict data modification operations on the view 

c. To enforce referential integrity on the view 

d. To hide the view from certain users

 

Answer: a. To allow only read operations on the view

 

 31. What is the primary purpose of the "WITH CHECK OPTION" clause in a view definition in a DBMS?

a. To prevent data modification in the view 

b. To enforce referential integrity on the view 

c. To cascade the check option to related views 

d. To restrict data modification to rows that satisfy the view's defining condition

 

Answer: d. To restrict data modification to rows that satisfy the view's defining condition

 

 32. How does a view contribute to data abstraction in a DBMS?

a. By making data retrieval more complex 

b. By exposing the underlying complexity of data to users 

c. By providing a layer of abstraction between users and the underlying data 

d. By increasing data redundancy

 

Answer: c. By providing a layer of abstraction between users and the underlying data

 

 33. What is the primary advantage of using a view for data security in a DBMS?

a. Views expose all data to users 

b. Views enforce referential integrity on the data 

c. Views restrict access to specific columns and rows of the underlying tables 

d. Views increase the complexity of data access

 

Answer: c. Views restrict access to specific columns and rows of the underlying tables

 

 34. In a DBMS, what is the purpose of the "WITH CASCADED CHECK OPTION" clause in a view definition?

a. To enforce referential integrity on the view 

b. To cascade the check option to related views 

c. To allow unrestricted data modification in the view 

d. To restrict data modification to rows that satisfy the view's defining condition

 

Answer: b. To cascade the check option to related views

 

 35. What happens when a user queries a view in a DBMS?

a. Data is physically retrieved from the view 

b. Data is physically retrieved from the underlying tables based on the view's definition 

c. Data is stored in the view permanently 

d. Data is modified in the underlying tables

 

Answer: b. Data is physically retrieved from the underlying tables based on the view's definition

 

 36. What is the role of the "WITH READ ONLY" clause in a DBMS view definition?

a. To prevent data modification in the view 

b. To cascade the check option to related views 

c. To restrict access to specific columns of the view 

d. To enforce referential integrity on the view

 

Answer: a. To prevent data modification in the view

 

 37. How does a materialized view differ from a regular (non-materialized) view in a DBMS?

a. Materialized views are dynamic and reflect changes in the underlying data 

b. Regular views store physical data, while materialized views do not 

c. Materialized views are used for complex reporting, while regular views are for simple queries 

d. Regular views are more efficient for data modification operations

 

Answer: b. Regular views store physical data, while materialized views do not

 

 38. What is the purpose of an "INSTEAD OF" trigger in the context of a DBMS view?

a. To prevent data modification in the view 

b. To enforce referential integrity on the view 

c. To provide an alternative mechanism for handling data modification operations on the view 

d. To cascade the check option to related views

 

Answer: c. To provide an alternative mechanism for handling data modification operations on the view

 

 39. In a DBMS, what does the "WITH CHECK OPTION" clause do when modifying data through a view?

a. Allows unrestricted modification of data 

b. Enforces referential integrity on the view 

c. Restricts data modification to rows that satisfy the view's defining condition 

d. Limits the number of rows displayed in the view

 

Answer: c. Restricts data modification to rows that satisfy the view's defining condition

 

 40. How does a view contribute to improving data independence in a DBMS?

a. By exposing the underlying complexity of data to users 

b. By making data retrieval more complex 

c. By providing a layer of abstraction between users and the underlying data 

d. By restricting access to specific columns of the view

 

Answer: c. By providing a layer of abstraction between users and the underlying data

 

 41. What is the primary benefit of using a materialized view in a DBMS?

a. Materialized views are dynamic and reflect changes in the underlying data 

b. Materialized views improve data security 

c. Materialized views provide better performance for certain queries by precomputing results 

d. Materialized views have no impact on query performance

 

Answer: c. Materialized views provide better performance for certain queries by precomputing results

 

 42. What is the role of an "INSTEAD OF" trigger when modifying data through a view in a DBMS?

a. To prevent data modification in the view 

b. To enforce referential integrity on the view 

c. To provide an alternative mechanism for handling data modification operations on the view 

d. To cascade the check option to related views

 

Answer: c. To provide an alternative mechanism for handling data modification operations on the view

 

 43. How does a view contribute to data consistency in a DBMS?

a. By exposing the underlying complexity of data to users 

b. By making data retrieval more complex 

c. By providing a layer of abstraction between users and the underlying data 

d. By enforcing data constraints on the view

 

Answer: d. By enforcing data constraints on the view

 

 44. In a DBMS, what is the significance of the "WITH READ ONLY" clause when querying a view?

a. To prevent data modification in the view 

b. To allow unrestricted data modification in the view 

c. To restrict access to specific columns of the view 

d. To enforce referential integrity on the view

 

Answer: a. To prevent data modification in the view

 

 45. What is the primary advantage of using a view in a DBMS for data reporting purposes?

a. Views do not support data reporting 

b. Views provide a direct connection to the underlying data 

c. Views simplify the reporting process by presenting a tailored view of the data 

d. Views make the reporting process more complex

 

Answer: c. Views simplify the reporting process by presenting a tailored view of the data

 

 46. How does a view contribute to improving data independence in a DBMS?

a. By exposing the underlying complexity of data to users 

b. By making data retrieval more complex 

c. By providing a layer of abstraction between users and the underlying data 

d. By restricting access to specific columns of the view

 

Answer: c. By providing a layer of abstraction between users and the underlying data

 

 47. What is the primary difference between a view and a table in a DBMS?

a. Tables store virtual data, while views store physical data 

b. Views are permanent storage units, while tables are temporary 

c. Views are based on SELECT queries and do not store physical data, while tables store physical data 

d. Tables are used for complex queries, while views are used for simple queries

 

Answer: c. Views are based on SELECT queries and do not store physical data, while tables store physical data

 

 48. What happens when a user queries a materialized view in a DBMS?

a. Data is physically retrieved from the materialized view 

b. Data is physically retrieved from the underlying tables based on the materialized view's definition 

c. Data is stored in the materialized view permanently 

d. Data is modified in the underlying tables

 

Answer: a. Data is physically retrieved from the materialized view

 

 49. In a DBMS, what is the role of an "INSTEAD OF" trigger when querying a view?

a. To prevent data modification in the view 

b. To enforce referential integrity on the view 

c. To provide an alternative mechanism for handling data modification operations on the view 

d. To cascade the check option to related views

 

Answer: c. To provide an alternative mechanism for handling data modification operations on the view

 

 50. What is the purpose of the "WITH CHECK OPTION" clause in a view definition in a DBMS?

a. To prevent data modification in the view 

b. To enforce referential integrity on the view 

c. To cascade the check option to related views 

d. To restrict data modification to rows that satisfy the view's defining condition

 

Answer: d. To restrict data modification to rows that satisfy the view's defining condition

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