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Executing a distributed query
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When executing a distributed query against a linked server, use a fully qualified, four-part table name in the form linked_server_name.catalog.schema.object_name for each data source you are querying.
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Lesson 7: Configuring Linked Servers
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Here are the general steps for creating a linked server: 1. Expand the Server Objects node within Object Explorer in SSMS, as Figure 2-4 shows.
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Figure 2-4
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Manage Linked Servers from SSMS.
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2. Right-click the Linked Servers node and choose New Linked Server. 3. Figure 2-5 shows the General Page of the New Linked Server dialog box, in which you choose the linked server type you want to create. If you select SQL Server, the system will use the Microsoft SQL Native Client OLE DB Provider to connect to the linked server. For other data sources, you can select the correct OLE DB provider to use. For example, you select the Microsoft Jet 4.0 OLE DB Provider to connect to an Access database.
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Configuring SQL Server 2005
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Figure 2-5
Create a new linked server.
4. Select the Security page, which Figure 2-6 shows, to configure the security context that you will use for the linked server.
Figure 2-6
Configure the security model for a linked server.
Lesson 7: Configuring Linked Servers
Configuring the Security Model
When you use linked servers to access external data sources, you should pay special attention to the security context for the external connection. You can configure the linked server to use one of the following three security modes:
Self-mapping When a linked server is created, this mode is added for all local logins, so SQL Server tries to connect to the external data source using the current user s login credentials. The same login and password must exist on the remote server. This is the default behavior. Delegation
This mode impersonates the Windows local credentials; the connection forwards the credentials of an authenticated Windows user to the linked server. The Windows user account and password must exist on the linked server. This mode lets you map local logins to remote logins on the external data source.
Remote Credentials
Delegation of operating system logins is the securest mechanism, but you can use it only when the external data source supports Windows authentication. In other cases, you should map local logins to remote credentials to have a secure context for the connection to the external data source.
PRACTICE
Creating a Microsoft Access Linked Server
In this practice, you create a linked server, link it to a Microsoft Access database called C:\Practice Files\Northwind.mdb, and then query the Customer table on the Access database. You use the sp_addlinkedserver stored procedure to accomplish this task. The basic syntax for this stored procedure is
sp_addlinkedserver <server_name>,<product_name>,<oledb provider name>, <data source>
1. Browse the companion CD and copy the \Practice Files\Northwind.mdb database to C:\Practice Files\Northwind.mdb. 2. Open SQL Server Management Studio. In the Login dialog box, click OK, and then click New Query. Create a linked server called North and link it to the Access database C:\Practice Files\Northwind.mdb by executing the sp_ addlinkedserver stored procedure, as follows:
EXECUTE sp_addlinkedserver 'North', 'OLE DB Provider for Jet', 'Microsoft.Jet.OLEDB.4.0','C:\Practice Files\Northwind.mdb'
3. Test your access to the remote database by issuing the following query against the Customers table:
SELECT * FROM North...Customers
2
Configuring SQL Server 2005
Lesson Summary
Linked servers are server objects that let you connect and execute commands on remote data sources, including non-SQL Server data sources. To define a linked server, you specify the external data source, an OLE DB provider, to connect to that source, and the security context of the connection. After creating a linked server, you can access its objects by using the fully qualified, four-part table name.
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.
1. When do you need to specify an external data source by using a linked server A. When you need to access a different database. B. When you need to access a different instance. C. When you need to access a different database schema D. When you need to access objects of a different user owner. 2. What do you need to specify to create a linked server (Choose all that apply.) A. OLE DB Data Source B. ODBC Data Source C. ODBC Provider D. OLE DB Provider 3. Which of the following sentences are true for linked server security (Choose all that apply.) A. The security mode is defined at the instance level. B. The default configuration is self-mapping. C. The default configuration is delegation. D. The security mode is defined per linked server.
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