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1. What are the user account requirements for a double hop 2. Which stored procedures are used to add and drop login mappings
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1. The user s Windows authenticated account must have access permissions on connecting and destination instances. The account that the connecting instance runs under must be trusted for delegation. The linked server logins must be configured for self-mapping (accomplished using sp_addlinkedsrvlogin). 2. Login mappings are added using sp_addlinkedsrvlogin and dropped using sp_droplinkedsrvlogin. Self-mapping does not work if security account delegation is unavailable or if the connecting or destination instances are not configured for Windows Authentication mode. Administrators should review the Account Is Sensitive And Cannot Be Delegated and Account Is Trusted For Delegation settings when self-mapping does not work. (You can review these settings by examining the user account s properties within Active Directory Users And Computers.) If self-mapping is not possible, SQL Server authentication and server login mappings are necessary.
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Lesson 4: Designing a Strategy to Manage Data Across Linked Servers
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Configuring Linked Server Options
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You use the sp_serveroption system stored procedure to configure server-level options rather than provider-level options. This configuration allows you to configure two different linked servers that use the same OLE DB provider to behave differently. Table 6-3 describes linked server options.
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Description When this option is set to true, SQL Server uses collation information of character columns from the linked server. This is useful when multiple databases on the remote server use different collations. Specifies collation that is used for character data from the linked server if the Use Remote Collation option is set to true and the data source is not a SQL Server data source. Do not set if the linked server has multiple collations within a single data source. This option is ignored if the linked server is SQL Server 2005. Time-out value in seconds for the connection to the linked server. If this option is not set, the global configuration option remote login time-out is the default. If this option is set to false, SQL Server checks for schema changes that have occurred since compilation in remote tables. The check occurs prior to query execution. If a change has occurred, SQL Server recompiles the query with new schema. If this option is set to true, schema checking does not occur until execution.
Collation Name
Connection Timeout
Lazy Schema Validation
6
Database Maintenance
MORE INFO
Configuring linked server options
For more information about configuring linked server options, consult the following MSDN article: msdn2.microsoft.com/en-us/library/ms178532(d=ide).aspx.
Lesson Summary
Linked servers are most often used to handle distributed queries. Distributed queries are queries that access data from multiple heterogeneous data sources. SQL Server supports distributed queries using OLE DB. Linked-server definitions require both an OLE DB provider and an OLE DB data source. Delegation is the process by which SQL Server forwards the credentials of an authenticated Windows user. Self-mapping is when the currently used credentials are emulated for resolving queries against linked servers. Login mappings are added using sp_addlinkedsrvlogin and dropped using sp_droplinkedsrvlogin.
Lesson Review
You can use the following questions to test your knowledge of the information in Lesson 4, Designing a Strategy to Manage Data Across Linked Servers. 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 correct or incorrect are located in the Answers section at the end of the book.
1. Which of the following conditions are necessary to support self-mapping (Choose all that apply.) A. The destination instance is configured to support Windows authentication. B. The connecting instance is configured to support SQL Server authentication. C. The connecting instance is configured to support Windows authentication. D. The destination instance is configured to support SQL Server authentication.
Lesson 4: Designing a Strategy to Manage Data Across Linked Servers
2. Three users of the system for which you are the administrator are able to execute distributed queries through a linked-server configuration. Another user is unable to. All four users authenticate with the connecting server using Windows authentication. Login mappings use default settings, and no login mappings have been configured for any users. Which of the following is the most likely reason that only the fourth user is unable to execute distributed queries against the linked server A. The destination instance does not support Windows authentication. B. The destination instance does not support SQL Server authentication. C. The Account Is Trusted For Delegation account property is set in Active Directory. D. The Account Is Sensitive And Cannot Be Delegated account property is set in Active Directory.
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