Data independence MCQs in DBMS

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 23, 2024

1. What is data independence in the context of DBMS?

a) The ability to separate data from applications
b) The ability to change the schema at one level without affecting the schema at the next higher level
c) The ability to control data access and security
d) The ability to visualize data in various formats

Answer: b) The ability to change the schema at one level without affecting the schema at the next higher level

2. Physical data independence allows changes to be made to which aspect of the database?

a) User-specific views
b) Logical data model
c) Physical storage of data
d) Data integrity constraints

Answer: c) Physical storage of data

3. Which of the following best describes logical data independence?

a) The capacity to change the internal schema without changing the conceptual schema
b) The capacity to change the conceptual schema without changing the external schema
c) The ability to modify user views without affecting the conceptual schema
d) The ability to alter data storage methods without impacting application programs

Answer: b) The capacity to change the conceptual schema without changing the external schema

4. Which schema level is concerned with providing logical data independence?

a) External Schema
b) Conceptual Schema
c) Internal Schema
d) Physical Schema

Answer: b) Conceptual Schema

5. A database system demonstrates physical data independence when:

a) Changes in the physical storage do not require changes in the conceptual schema
b) Changes in the user views do not require changes in the internal schema
c) Changes in the conceptual schema do not require changes in application programs
d) Changes in application programs do not require changes in the user views

Answer: a) Changes in the physical storage do not require changes in the conceptual schema

6. What is a key benefit of achieving data independence in a database system?

a) Improved query performance
b) Enhanced data security
c) Easier maintenance and adaptability of the database
d) Increased data redundancy

Answer: c) Easier maintenance and adaptability of the database

7. In the three-schema architecture, logical data independence is primarily achieved by which separation?

a) Between the external and internal schema
b) Between the external and conceptual schema
c) Between the conceptual and internal schema
d) Between the external and physical schema

Answer: b) Between the external and conceptual schema

8. Which of the following scenarios best exemplifies physical data independence?

a) Modifying a table structure in the internal schema without changing the conceptual schema
b) Changing the way data is stored on disk without impacting the external schema
c) Adding new fields to a user view without altering the internal schema
d) Renaming a table in the external schema without affecting the internal schema

Answer: b) Changing the way data is stored on disk without impacting the external schema

9. What challenge is typically mitigated by having a high degree of data independence?

a) Data redundancy
b) Data consistency
c) Data access speed
d) Impact of schema changes on applications

Answer: d) Impact of schema changes on applications

10. Which of the following is not directly related to achieving data independence in a DBMS?

a) Use of data abstraction layers
b) Implementation of user-defined data types
c) Separation of concerns between different schema levels
d) Standardization of data storage formats

Answer: b) Implementation of user-defined data types

 

More MCQs Of Database Systems

1. Database Models MCQs in DBMS
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   2. Network model MCQs in DBMS
   3. Relational model MCQs in DBMS
   4. Object-oriented model MCQs in DBMS
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   3. Integrity constraints MCQs in DBMS
3. SQL (Structured Query Language) MCQs in DBMS
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6. Storage and File Structure MCQs in DBMS
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7. Query Processing and Optimization MCQs in DBMS
8. Database Transaction Management MCQs in DBMS
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11. Distributed Databases MCQs in DBMS
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