ALTER TABLE HumanResources.JobCandidate ADD Comments varbinary(8000) GO in Visual Studio .NET

Printer PDF417 in Visual Studio .NET ALTER TABLE HumanResources.JobCandidate ADD Comments varbinary(8000) GO

ALTER TABLE HumanResources.JobCandidate ADD Comments varbinary(8000) GO
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Configuring SQL Server 2005
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2. Before using the EncryptByKey function to encrypt the data, you need to open the symmetric key by using the certificate you created earlier. Execute the following code to both use the certificate to decrypt the symmetric key and then to use EncryptByKey to encrypt the Comments column:
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OPEN SYMMETRIC KEY CommentKey DECRYPTION BY CERTIFICATE HRCert UPDATE HumanResources.JobCandidate SET Comments = EncryptByKey(Key_GUID('CommentKey'), 'No Comments') GO
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3. Query the HumanResources.jobCandidate table. You can see that the data is encrypted:
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SELECT JobCandidateID,ModifiedDate, Comments FROM HumanResources.JobCandidate
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4. To access the data in the encrypted column, you need to decrypt the column by executing the following code:
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OPEN SYMMETRIC KEY CommentKey DECRYPTION BY CERTIFICATE HRCert; SELECT JobCandidateID, ModifiedDate, CONVERT(varchar, DecryptByKey(Comments)) AS "Decrypted Comments" FROM HumanResources.JobCandidate
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The ability to encrypt data is a new feature that is built into SQL Server 2005. The database engine gives you a hierarchical encryption infrastructure ranging from the service master key to symmetric and asymmetric keys to database certificates that lets you manage encryption in a secure, flexible way. To select the appropriate encryption mechanism for your environment, you need to balance your security and performance requirements.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
Lesson 6: Configuring Encryption
1. Which of the following sentences is true for the service master key A. You should create the service master key by using the Surface Area Configuration Tool. B. The database engine creates the service master key automatically. The service master key can be opened only by the user account that installs SQL Server. C. The database engine creates the service master key automatically. The service master key can be opened only by the user account that starts the SQL Server service. D. You should create the service master key automatically from SQL Server Configuration. 2. Which of the following statements enables you to create a database certificate A. CREATE CERTIFICATE MyCert WITH SUBJECT= Certificate Subject B. CREATE CERTIFICATE MyCert , Certificate Subject C. CREATE CERT MyCert , Certificate Subject D. CREATE CERT MyCert WITH TARGET= Certificate Subject 3. Which of the following sentences are true for the database master key (Choose all that apply.) A. The database master key is optional. B. The database master key is mandatory if you want to encrypt data. C. The database master key is created automatically when you create the first certificate. D. The database master key is created manually.
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Configuring SQL Server 2005
Lesson 7: Configuring Linked Servers
SQL Server lets you access external data sources from your local Transact-SQL code. You can get ad hoc access to external data sources by using the OPENROWSET function. When you need to access data outside your local instance such as a remote SQL Server; another instance in your server; or a Microsoft Access, Oracle, or other database on a regular basis, you create a linked server to access the external data source. Linked servers also let you configure distributed environments such as replication. To create a linked server, you need an OLE DB provider that lets you connect to the external data source. The key to good performance for non-SQL Server linked servers, such as AS/400 or Oracle, is to select a good OLE DB provider.
After this lesson, you will be able to:
Specify the external data source. Specify the characteristics of the data source. Specify the security model of the data source.
Estimated lesson time: 10 minutes
How to Create a Linked Server
You need to define a linked server for each external data source you want to access and then configure the security context under which your distributed queries will run. After you create a linked server, you can use the Transact-SQL OPENQUERY function to execute your distributed queries.
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