Q. Which of the following is a characteristic of a weak entity?
A.
It can exist independently of other entities
B.
It has a primary key of its own
C.
It relies on a strong entity for its identification
D.
It cannot have attributes
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Solution
A weak entity relies on a strong entity for its identification and does not have a primary key of its own.
Correct Answer:
C
— It relies on a strong entity for its identification
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Q. Which of the following is a characteristic of a well-designed database?
A.
High data redundancy
B.
Low data integrity
C.
Minimal data anomalies
D.
Complex relationships
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Solution
A well-designed database should have minimal data anomalies, ensuring data integrity and consistency.
Correct Answer:
C
— Minimal data anomalies
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Q. Which of the following is a common architecture for distributed databases?
A.
Client-server architecture
B.
Peer-to-peer architecture
C.
Three-tier architecture
D.
All of the above
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Solution
All of the above architectures can be used in distributed databases, depending on the specific requirements and design.
Correct Answer:
D
— All of the above
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Q. Which of the following is a common concurrency control mechanism?
A.
Two-Phase Locking
B.
Single-Phase Locking
C.
Optimistic Locking
D.
Pessimistic Locking
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Solution
Two-Phase Locking is a widely used concurrency control mechanism that ensures serializability.
Correct Answer:
A
— Two-Phase Locking
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Q. Which of the following is a common method for achieving data consistency in distributed databases?
A.
Two-phase commit protocol
B.
Single-phase commit protocol
C.
Data normalization
D.
Indexing
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Solution
The two-phase commit protocol is a common method used to achieve data consistency in distributed databases by ensuring all nodes agree on a transaction before it is committed.
Correct Answer:
A
— Two-phase commit protocol
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Q. Which of the following is a common method for ensuring data consistency in a data warehouse?
A.
Data replication
B.
Data normalization
C.
Data denormalization
D.
Data partitioning
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Solution
Data replication is a common method used to ensure data consistency across different systems in a data warehouse.
Correct Answer:
A
— Data replication
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Q. Which of the following is a common method for implementing concurrency control?
A.
Two-phase locking
B.
Data replication
C.
Partitioning
D.
Sharding
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Solution
Two-phase locking is a common method for implementing concurrency control to prevent conflicts between transactions.
Correct Answer:
A
— Two-phase locking
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Q. Which of the following is a common query language for Object-Oriented Databases?
A.
SQL
B.
OQL
C.
PL/SQL
D.
T-SQL
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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?
A.
Storing simple text data
B.
Managing complex data with relationships
C.
Handling large volumes of transactions
D.
Creating flat file databases
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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 a component of DBMS architecture?
A.
User Interface
B.
Database Engine
C.
Data Storage
D.
All of the above
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Solution
All of the above are components of DBMS architecture, including user interface, database engine, and data storage.
Correct Answer:
D
— All of the above
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Q. Which of the following is a concurrency control mechanism?
A.
Two-phase locking
B.
Data normalization
C.
Indexing
D.
Entity-relationship modeling
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Solution
Two-phase locking is a concurrency control mechanism that ensures transactions are executed in a way that prevents conflicts.
Correct Answer:
A
— Two-phase locking
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Q. Which of the following is a disadvantage of normalization?
A.
Increased data redundancy
B.
Complex queries
C.
Improved data integrity
D.
Reduced data anomalies
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Solution
Normalization can lead to complex queries because data is spread across multiple tables, requiring more joins to retrieve related data.
Correct Answer:
B
— Complex queries
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Q. Which of the following is a feature of ADO.NET?
A.
Disconnected data architecture
B.
Direct database connection only
C.
No support for XML
D.
Single-threaded access
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Solution
ADO.NET supports a disconnected data architecture, allowing for data manipulation without a constant connection to the database.
Correct Answer:
A
— Disconnected data architecture
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Q. Which of the following is a feature of ASP.NET compared to classic ASP?
A.
Supports server-side scripting only
B.
Uses a compiled model for better performance
C.
Does not support web forms
D.
Is limited to Microsoft SQL Server
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Solution
ASP.NET uses a compiled model, which provides better performance compared to classic ASP, which is interpreted.
Correct Answer:
B
— Uses a compiled model for better performance
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Q. Which of the following is a feature of MySQL?
A.
Supports only SQL queries
B.
Is a NoSQL database
C.
Is open-source
D.
Does not support transactions
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Solution
MySQL is an open-source relational database management system that supports SQL queries and transactions.
Correct Answer:
C
— Is open-source
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Q. Which of the following is a key feature of ADO.NET?
A.
Supports only SQL Server
B.
Uses disconnected data architecture
C.
Requires a constant connection to the database
D.
Does not support XML data
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Solution
ADO.NET uses a disconnected data architecture, allowing applications to work with data without a constant connection to the database.
Correct Answer:
B
— Uses disconnected data architecture
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Q. Which of the following is a method for concurrency control in distributed databases?
A.
Two-phase locking
B.
Data sharding
C.
Indexing
D.
Data warehousing
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Solution
Two-phase locking is a method for concurrency control in distributed databases that helps prevent conflicts when multiple transactions access the same data.
Correct Answer:
A
— Two-phase locking
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Q. Which of the following is a method to load XML data into a DataSet?
A.
ReadXml
B.
LoadXml
C.
ImportXml
D.
ParseXml
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Solution
The ReadXml method is used to load XML data into a DataSet in ADO.NET.
Correct Answer:
A
— ReadXml
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Q. Which of the following is a potential problem that normalization aims to solve?
A.
Data redundancy
B.
Data encryption
C.
Data visualization
D.
Data migration
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Solution
Normalization aims to solve data redundancy by organizing data into separate tables to minimize duplication.
Correct Answer:
A
— Data redundancy
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Q. Which of the following is a primary purpose of OLE DB?
A.
To provide a uniform interface for accessing data from different sources
B.
To manage database transactions
C.
To perform data normalization
D.
To create ER diagrams
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Solution
OLE DB is designed to provide a uniform interface for accessing data from various sources, including relational and non-relational databases.
Correct Answer:
A
— To provide a uniform interface for accessing data from different sources
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Q. Which of the following is a type of indexing in databases?
A.
B-tree indexing
B.
C-tree indexing
C.
D-tree indexing
D.
E-tree indexing
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Solution
B-tree indexing is a common type of indexing used in databases to improve the speed of data retrieval.
Correct Answer:
A
— B-tree indexing
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Q. Which of the following is a type of indexing?
A.
Clustered Index
B.
Non-Clustered Index
C.
Full-Text Index
D.
All of the above
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Solution
All of the above options are types of indexing used to improve the speed of data retrieval operations in a database.
Correct Answer:
D
— All of the above
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Q. Which of the following is a type of JOIN in SQL?
A.
INNER JOIN
B.
OUTER JOIN
C.
CROSS JOIN
D.
All of the above
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Solution
All of the above options are types of JOINs in SQL, used to combine rows from two or more tables.
Correct Answer:
D
— All of the above
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Q. Which of the following is a type of SQL join?
A.
INNER JOIN
B.
OUTER JOIN
C.
CROSS JOIN
D.
All of the above
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Solution
INNER JOIN, OUTER JOIN, and CROSS JOIN are all types of SQL joins used to combine rows from two or more tables.
Correct Answer:
D
— All of the above
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Q. Which of the following is a valid data type in SQL Server 2000?
A.
VARCHAR
B.
STRING
C.
TEXT
D.
CHARACTER
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Solution
VARCHAR is a valid data type in SQL Server 2000, used for variable-length strings.
Correct Answer:
A
— VARCHAR
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Q. Which of the following is a valid JDBC URL format for MySQL?
A.
jdbc:mysql://localhost:3306/mydb
B.
mysql://localhost:3306/mydb
C.
jdbc:mySQL://localhost:3306/mydb
D.
jdbc:mysql:localhost:3306/mydb
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Solution
The valid JDBC URL format for MySQL is 'jdbc:mysql://localhost:3306/mydb'.
Correct Answer:
A
— jdbc:mysql://localhost:3306/mydb
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Q. Which of the following is a valid SQL statement to retrieve all records from a table named 'users'?
A.
SELECT * FROM users;
B.
GET ALL FROM users;
C.
FETCH ALL FROM users;
D.
RETRIEVE * FROM users;
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Solution
The correct SQL statement to retrieve all records from a table is 'SELECT * FROM users;'.
Correct Answer:
A
— SELECT * FROM users;
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Q. Which of the following is a valid transaction control command in SQL Server 2000?
A.
BEGIN TRANSACTION
B.
START TRANSACTION
C.
COMMIT WORK
D.
ROLLBACK WORK
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Solution
The valid transaction control command in SQL Server 2000 is 'BEGIN TRANSACTION'.
Correct Answer:
A
— BEGIN TRANSACTION
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Q. Which of the following is an example of a weak entity?
A.
A customer with a unique ID
B.
An order that depends on a customer
C.
A product with a SKU
D.
A department with a manager
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Solution
An order that depends on a customer is an example of a weak entity, as it cannot exist without the customer.
Correct Answer:
B
— An order that depends on a customer
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Q. Which of the following is an example of an attribute in an ER model?
A.
Customer
B.
Orders
C.
OrderID
D.
Many-to-Many
Show solution
Solution
OrderID is an example of an attribute in an ER model.
Correct Answer:
C
— OrderID
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