Q. How can ADO.NET handle concurrency when working with XML data?
A.
By using optimistic concurrency control
B.
By locking the XML file during access
C.
By using a transaction log
D.
By serializing all access to the XML data
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Solution
ADO.NET can handle concurrency using optimistic concurrency control, which allows multiple users to access the data without locking it.
Correct Answer:
A
— By using optimistic concurrency control
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Q. In ADO.NET, which class is used to represent a connection to a database?
A.
SqlConnection
B.
SqlCommand
C.
SqlDataAdapter
D.
SqlDataReader
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Solution
SqlConnection class is used to establish a connection to a SQL Server database in ADO.NET.
Correct Answer:
A
— SqlConnection
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Q. In an Entity-Relationship (ER) model, what does an entity represent?
A.
A relationship between two tables
B.
A single piece of data
C.
A real-world object or concept
D.
A database transaction
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Solution
In an ER model, an entity represents a real-world object or concept that can have data stored about it.
Correct Answer:
C
— A real-world object or concept
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Q. In the context of XML and ADO.NET, what does the DataSet represent?
A.
A single table of data
B.
An in-memory representation of data
C.
A direct connection to the database
D.
A method for data normalization
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Solution
The DataSet in ADO.NET represents an in-memory collection of data, which can include multiple tables and relationships.
Correct Answer:
B
— An in-memory representation of data
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Q. In the context of XML and ADO.NET, what does the term 'serialization' refer to?
A.
Converting XML data into a database format
B.
Transforming a DataSet into XML format
C.
Storing XML data in a binary format
D.
Creating a schema for XML data
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Solution
Serialization in this context refers to the process of converting a DataSet or other data structure into XML format for storage or transmission.
Correct Answer:
B
— Transforming a DataSet into XML format
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Q. What does ADO.NET primarily use to interact with XML data?
A.
DataSet
B.
DataReader
C.
DataAdapter
D.
Command
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Solution
ADO.NET uses DataSet to work with XML data, allowing for in-memory representation and manipulation.
Correct Answer:
A
— DataSet
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Q. What is the primary purpose of ADO.NET in relation to databases?
A.
To provide a way to store XML data
B.
To connect and interact with databases
C.
To manage database transactions
D.
To perform data normalization
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Solution
ADO.NET is primarily used to connect and interact with databases, allowing for data retrieval and manipulation.
Correct Answer:
B
— To connect and interact with databases
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Q. What is the primary purpose of ADO.NET in relation to XML?
A.
To provide a way to store XML data in a database
B.
To enable data access and manipulation in .NET applications
C.
To convert XML data into SQL queries
D.
To generate XML schemas from database tables
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Solution
ADO.NET is primarily used for data access and manipulation in .NET applications, allowing developers to work with data from various sources, including XML.
Correct Answer:
B
— To enable data access and manipulation in .NET applications
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Q. What is the primary purpose of indexing in a database?
A.
To speed up data retrieval
B.
To ensure data integrity
C.
To enforce constraints
D.
To store data
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Solution
Indexing is primarily used to speed up the retrieval of rows from a database table.
Correct Answer:
A
— To speed up data retrieval
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Q. What is the purpose of the DataAdapter in ADO.NET when dealing with XML?
A.
To connect to a database
B.
To fill a DataSet with data from XML
C.
To execute commands against XML data
D.
To manage transactions
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Solution
The DataAdapter is used to fill a DataSet with data from XML and to update the XML data source.
Correct Answer:
B
— To fill a DataSet with data from XML
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Q. What is the role of a transaction in a database?
A.
To group multiple operations
B.
To create a backup
C.
To optimize queries
D.
To enforce data types
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Solution
A transaction groups multiple operations into a single unit of work, ensuring all or none are executed.
Correct Answer:
A
— To group multiple operations
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Q. What is the role of an index in a database?
A.
To store XML data
B.
To speed up data retrieval
C.
To enforce data integrity
D.
To manage transactions
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Solution
An index is used to speed up data retrieval operations on a database table.
Correct Answer:
B
— To speed up data retrieval
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Q. What is the role of the DataSet in ADO.NET when working with XML?
A.
To execute SQL commands
B.
To provide a disconnected data architecture
C.
To manage database connections
D.
To perform data validation
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Solution
The DataSet provides a disconnected data architecture, allowing data to be manipulated without a constant connection to the database.
Correct Answer:
B
— To provide a disconnected data architecture
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Q. What is the significance of the 'Schema' in XML when used with ADO.NET?
A.
It defines the structure of the XML data
B.
It improves the performance of data access
C.
It is used to encrypt XML data
D.
It allows for data compression
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Solution
The schema defines the structure of the XML data, ensuring that the data adheres to a specific format.
Correct Answer:
A
— It defines the structure of the XML data
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Q. Which ADO.NET class is primarily used to manipulate XML data in a DataSet?
A.
XmlDocument
B.
DataTable
C.
DataRelation
D.
XmlSchema
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Solution
The DataTable class is used to manipulate XML data within a DataSet, representing a single table of in-memory data.
Correct Answer:
B
— DataTable
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Q. Which ADO.NET component is used to execute SQL commands?
A.
DataAdapter
B.
DataReader
C.
Command
D.
Connection
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Solution
The Command object in ADO.NET is used to execute SQL commands against a database.
Correct Answer:
C
— Command
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Q. Which ADO.NET component is used to read XML data?
A.
DataReader
B.
DataSet
C.
DataAdapter
D.
XmlReader
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Solution
XmlReader is specifically designed to read XML data in a forward-only, read-only manner.
Correct Answer:
D
— XmlReader
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Q. Which method is used to load XML data into a DataSet in ADO.NET?
A.
LoadXml()
B.
ReadXml()
C.
ImportXml()
D.
FillXml()
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Solution
The ReadXml() method is used to load XML data into a DataSet.
Correct Answer:
B
— ReadXml()
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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 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 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 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 NOT a benefit of using ADO.NET with XML?
A.
Easy data manipulation
B.
Support for disconnected data access
C.
Automatic data normalization
D.
Integration with web services
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Solution
ADO.NET does not automatically normalize data; normalization is a separate design process in database management.
Correct Answer:
C
— Automatic data normalization
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Q. Which of the following is NOT a benefit of using XML with ADO.NET?
A.
Interoperability between different systems
B.
Ease of data manipulation
C.
Increased performance over traditional databases
D.
Support for hierarchical data structures
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Solution
While XML provides many benefits, it does not inherently increase performance over traditional databases, especially for large datasets.
Correct Answer:
C
— Increased performance over traditional databases
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