Q. In Object-Oriented Databases, what does 'inheritance' allow?
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A.
Creating new classes based on existing ones
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B.
Storing data in a flat structure
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C.
Using only primitive data types
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D.
Eliminating the need for relationships
Solution
Inheritance allows for creating new classes based on existing ones, promoting code reuse and organization.
Correct Answer:
A
— Creating new classes based on existing ones
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Q. In the context of Object-Oriented Databases, what is 'encapsulation'?
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A.
Hiding the internal state of an object
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B.
Creating multiple instances of a class
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C.
Normalizing data
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D.
Establishing relationships between tables
Solution
Encapsulation is the concept of hiding the internal state of an object and requiring all interaction to be performed through an object's methods.
Correct Answer:
A
— Hiding the internal state of an object
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Q. What does 'concurrency control' refer to in Object-Oriented Databases?
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A.
Managing simultaneous operations without conflicts
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B.
Creating new object classes
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C.
Normalizing data structures
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D.
Defining relationships between objects
Solution
Concurrency control refers to managing simultaneous operations to ensure data integrity and prevent conflicts.
Correct Answer:
A
— Managing simultaneous operations without conflicts
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Q. What does 'polymorphism' in Object-Oriented Databases refer to?
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A.
The ability to process different data types in a uniform way
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B.
The use of multiple databases
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C.
The normalization of data
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D.
The creation of multiple tables
Solution
Polymorphism refers to the ability to process different data types in a uniform way, allowing for flexibility in data handling.
Correct Answer:
A
— The ability to process different data types in a uniform way
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Q. What is a common method for ensuring data consistency in Object-Oriented Databases during transactions?
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A.
Two-phase commit protocol
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B.
Normalization
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C.
Data denormalization
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D.
Flat file management
Solution
The two-phase commit protocol is commonly used to ensure data consistency during transactions.
Correct Answer:
A
— Two-phase commit protocol
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Q. What is a key feature of Object-Oriented Databases?
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A.
Support for complex data types
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B.
Use of SQL exclusively
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C.
Flat file storage
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D.
No support for relationships
Solution
Object-Oriented Databases support complex data types, allowing for the representation of real-world entities more effectively.
Correct Answer:
A
— Support for complex data types
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Q. What is a potential drawback of Object-Oriented Databases?
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A.
Limited support for complex data types
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B.
Higher complexity in database design
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C.
Inability to handle large volumes of data
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D.
Lack of transaction support
Solution
Object-Oriented Databases can introduce higher complexity in design due to their advanced features and data structures.
Correct Answer:
B
— Higher complexity in database design
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Q. What is the primary advantage of using Object-Oriented Databases over relational databases?
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A.
Better performance for simple queries
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B.
Ability to handle complex data relationships
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C.
Easier to learn for SQL users
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D.
More efficient storage of flat data
Solution
Object-Oriented Databases excel in handling complex data relationships, making them suitable for applications with intricate data structures.
Correct Answer:
B
— Ability to handle complex data relationships
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Q. What is the primary purpose of indexing in Object-Oriented Databases?
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A.
To enforce data integrity
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B.
To speed up data retrieval
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C.
To normalize data
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D.
To create relationships
Solution
Indexing is primarily used to speed up data retrieval operations in databases.
Correct Answer:
B
— To speed up data retrieval
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Q. What is the role of a transaction in an Object-Oriented Database?
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A.
To define the structure of objects
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B.
To ensure data consistency and integrity
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C.
To create indexes
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D.
To manage user permissions
Solution
Transactions ensure data consistency and integrity by grouping operations that must all succeed or fail together.
Correct Answer:
B
— To ensure data consistency and integrity
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Q. Which of the following best describes an Object-Relational Database?
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A.
A database that only supports objects
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B.
A hybrid of relational and object-oriented features
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C.
A database that uses only flat files
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D.
A database that does not support SQL
Solution
An Object-Relational Database combines features of both relational and object-oriented databases.
Correct Answer:
B
— A hybrid of relational and object-oriented features
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Q. Which of the following is a benefit of using Object-Oriented Databases?
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A.
Easier data modeling for complex applications
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B.
Strict adherence to SQL standards
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C.
Limited data types
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D.
No support for relationships
Solution
Object-Oriented Databases provide easier data modeling for complex applications due to their support for complex data types and relationships.
Correct Answer:
A
— Easier data modeling for complex applications
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Q. Which of the following is a common query language for Object-Oriented Databases?
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A.
SQL
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B.
OQL
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C.
PL/SQL
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D.
T-SQL
Solution
OQL (Object Query Language) is specifically designed for querying Object-Oriented Databases.
Correct Answer:
B
— OQL
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Q. Which of the following is a common use case for Object-Oriented Databases?
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A.
Storing simple text data
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B.
Managing complex data with relationships
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C.
Handling large volumes of transactions
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D.
Creating flat file databases
Solution
Object-Oriented Databases are commonly used for managing complex data with intricate relationships.
Correct Answer:
B
— Managing complex data with relationships
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Q. Which of the following is NOT a characteristic of Object-Oriented Databases?
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A.
Encapsulation
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B.
Inheritance
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C.
Polymorphism
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D.
Relational tables
Solution
Relational tables are a characteristic of relational databases, not Object-Oriented Databases.
Correct Answer:
D
— Relational tables
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