TS: Windows Server 2008 Network Infrastructure, Configuring : 70-642 Exam

Exam Number/Code: 70-642
Exam Name: TS: Windows Server 2008 Network Infrastructure, Configuring

“TS: Windows Server 2008 Network Infrastructure, Configuring”, also known as 70-642 exam, is a Microsoft certification.
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QUESTION 1
Your Microsoft SQL Server database contains a table named Customers. Customers contains three
columns named FamilyName, PersonalName, and Address.
You instantiate a SqlCommand object named CKCommand that you will use to populate a
DataReader object named customersDataReader. You need to initialize CKCommand to load
customersDataReader to include FamilyName and PersonalName for all rows in Customers.
Which code segment should you use?

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A. CKCommand.CommandText = “SELECT FamilyName,” + “PersonalName FROM
Customers”;
B. CKCommand.CommandType = “SELECT FamilyName,” + “PersonalName FROM
Customers”);
C. CKCommand.Parameters.Add(“SELECT FamilyName,” + “PersonalName FROM
Customers”);
D. CKCommand.ExecuteNonQuery();
Answer: A
Explanation: The CommandText property gets or sets the Transact-SQL statement or stored procedure to
execute at the data source. We should use it to set the SQL command we want to be executed.
Reference: .NET Framework Class Library, SqlCommand Members
Incorrect Answers
B: The CommandType property gets or sets a value indicating how the CommandText property is to be
interpreted.
C: The parameters should include the SQL code.
D: We must the SQL Statements before we execute them.
QUESTION 2
Your Microsoft SQL Server database Certkiller BackOrders contains a table that consists of more than
1 million rows. You need to develop an application that reads each row in the table and writes the
data to a flat file. The application will run only once each day. You want the application to process the
data as quickly as possible.
Which class should you use to retrieve the data?
A. DataSet
B. DataTable
C. DataReader
D. DataAdapter
Answer: C
Explanation: The ADO.NET DataReader is used to retrieve a read-only, forward-only stream of data from
a database. Using the DataReader can increase application performance and reduce system overhead because
only one row at a time is ever in memory. DataReader would meets the requirements of this scenario.
Reference: .NET Framework Developer’s Guide, Retrieving Data Using the DataReader [C#]
Incorrect Answers
A: Datasets is used when you want to work with a set of tables and rows while disconnected from the
data source. It would not be optimal when accessing the amount of data in this scenario.
Furthermore, only read-forward access is required.
B: A Data table represents one table of in-memory data.
D: The DataAdapter serves as a bridge between a DataSet and a data source for retrieving and saving
data.

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QUESTION 3
You are developing a order-processing application that retrieves data from a Microsoft SQL Server
database named Certkiller Data that contains a table named Customers and a table named Orders.
Customer has a primary key of customerID. Each row in orders has a CustomerID that indicates
which customer placed the order.
Your application uses a DataSet object named ordersDataSet to capture customer and order
information before it applied to the database. The ordersDataSet object has two Data Table objects
named Customers and Orders.
You want to ensure that a row cannot exist in the Orders Data Table object without a matching row
existing in the customers Data Table object.
Which two actions should you take? (Each correct answer presents part of the solution. Choose two.)
A. Create a foreign key constraint named ConstraintOrders that has Orders.CustomersID as the parent
column and Customers. CustomerID as the child column.
B. Create a foreign key constraint named ConstraintCustomers that has Customers.CustomerID as the
parent column and Orders.CustomerID as the child column.
C. Create a unique constraint named UniqueCustomers by using the Customers.CustomerID
D. Add ConstraintOrders to the Orders Data Table.
E. Add ConstraintOrders to the Customer Data Table.
F. Add ConstraintCustomers to the Orders Data Table.
G. Add ConstraintCustomers to the Customers Data Table.
H. Add UniqueCustomers to the Customers Data Table.
Answer: B, F
Explanation:
B: The parent column is located in the table on the “one-side”, while the child column is located on the
“many-side”. Here the Customers table is the parent domain and Orders is the child domain: each
Customer can have several orders, but for each specific order there must exists exactly one
corresponding row in the Customers table. We should use the ConstraintsCustomers constraints.
F: The constraint must be added to the Orders table.
Incorrect Answers
A: This is incorrect. The parent column must be CustomerID in the Customers table.
B, D: The ConstraintCustomers constraint must be used, not ConstraintOrders.
C, F: A unique constraint only applies to one single table.
E: The constraint must be added to the Orders table.

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