Figure 6-20 Microsoft OLE DB Provider for SQL Server options. in VB.NET

Make QR Code ISO/IEC18004 in VB.NET Figure 6-20 Microsoft OLE DB Provider for SQL Server options.

Figure 6-20 Microsoft OLE DB Provider for SQL Server options.
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A list of linked servers that are currently configured to use a provider are displayed in the bottom right-hand corner of the Provider Options dialog box. Options configured for each provider apply to all linked servers that use that provider. A description of each of the provider options is given in Table 6-2.
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Database Maintenance
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Table 6-2
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OLE DB Provider Options
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Provider Option DynamicParameters
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Description Allows the execution of parameterized queries against the provider. Can produce better performance for certain queries. Allows for nested SELECT statements in the FROM clause. Only level 0 OLE DB interfaces are invoked against the provider. Allows for the provider to be instantiated as an in-process server. The SQL Native Client OLE DB provider cannot be instantiated out of process. Updates against the provider are nonrecoverable because the provider does not support transactions. SQL Server attempts to use provider indexes to retrieve data. Controls ability of nonadministrators to run ad hoc queries through the OPENROWSET and OPENDATASOURCE functions. Provider supports the LIKE operator as implemented by SQL Server 2005.
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NestedQueries LevelZeroOnly AllowInProcess
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NonTransactedUpdates IndexAsAccessPath DisallowAdhocAccess
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SqlServerLike
CAUTION
Altering OLE DB provider options
Only experienced systems administrators should alter OLE DB provider options.
Configuring Linked Servers for Delegation
You can configure SQL Server and the Windows operating system so that a client connected to one instance of SQL Server can connect to another instance of SQL Server by forwarding the credentials of that authenticated Windows user. The term for this process is delegation. During delegation, the instance to which the Windows authenticated user has connected impersonates that user when contacting other
Lesson 4: Designing a Strategy to Manage Data Across Linked Servers
instances. This process is shown in Figure 6-21. Self-mapping is when the currently used security credentials are emulated for resolving queries against linked servers. When a linked server is added to an instance using sp_addlinkedserver, self-mapping is added by default for all local logins. If the linked server supports Windows Authentication, self-mapping for all Windows logins is supported.
Windows Account Impersonated Windows Account
Connecting Instance
Destination Instance (Configured as Linked Server on Connecting Instance)
Figure 6-21 During delegation, the server a user connects to impersonates that user when connecting to other servers to resolve distributed queries.
Double hop is the term used to describe when a user logs in to a client computer that connects to the first instance and runs a distributed query against a database on a linked server, which is a second separate instance. To participate in a double-hop configuration, the following conditions must be established:
Both client connecting instances and destination instances must be connected via a TCP/IP network. The user s Windows authenticated account must have access permissions on connecting and destination instances. Both connecting and destination instances must have Service Principal Names (SPNs) registered by the domain administrator. The account that the connecting instance runs under must be trusted for delegation. The destination instance must be added as a linked server on the connecting instance (using the sp_addlinkedserver stored procedure). The linked server logins must be configured for self-mapping (accomplished using the sp_addlinkedsrvlogin stored procedure).
6
Database Maintenance
Linked Server Security
Although accounts that use Windows Authentication are automatically self-mapped when you create a linked server, in some circumstances you need to create a login mapping between linked servers using stored procedures. You add login mappings by using sp_addlinkedsrvlogin and drop them by using sp_droplinkedsrvlogin. Login mapping sets up a remote login and password for the specified linked server and connecting instance login. When the connecting instance connects to a linked server to resolve a distributed query, the instance checks whether any login mappings exist for the current login. If a login mapping is found, the connecting instance transmits the remote login and password to the linked server. As mentioned earlier, the default configuration is self-mapping, emulating the credentials of the current user to connect to the linked server. The least administratively complex way of handling linked server security is to ensure that Windows authentication is used for all instances.
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