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To activate the SMP, all you need to do is specify . or (local) for the Server or Data Source key. You still need to specify the SQL Server instance being addressed unless you re connecting to the default instance. That s done by tacking on the instance name to the . or (local) in the connection string. Although it makes a lot of sense to use the local connection whenever possible, there might be drawbacks to this approach if the SQL Server has to compete with other resource-hungry applications on the same system, such as Reporting Services, Office, or Age of Empires. In a production environment, even when using SQL Express, I prefer to build a dedicated system whose sole purpose is to host an instance of SQL Server. Table 1 shows a number of example server key settings.
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Table 1 Typical server key settings SMP No Yes Yes Addresses Default instance on <server name> server Default instance on the local server
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The server key syntax SERVER=
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<server name>; as in MyServer .; or (local); .\<MyInstance>; as in .\SS2K8; <domain>\<server>\<instance>; <IP>,<Port>;
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as in 209.20.233.22,1433;
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<MyInstance> named instance on the local
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server Named instance on named server on named domain The specified server by IP address and port
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I don t recommend addressing any SQL Server instance via IP address and port. Why Well, it s tough to do, given the number of firewalls most (serious) organizations put up to prevent direct-port operations. It also assumes you ve gone to the trouble of disabling the dynamic IP port assignment scheme used by SQL Server 2005 and later. Accessing a SQL Server instance over the Internet IMHO: madness.
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One of the critical components you need to include in your connection string is your application s or your user s credentials. You have two choices: Request a trusted connection. This approach captures the Windows user or IIS credentials and passes them to SQL Server for authentication. Supply a user ID and password that are passed to SQL Server for authentication. In either case you must create a login for the specified user or for the domain group that includes the user s Windows login ID unless you re connecting as the SQL Server system administrator or a member of the administrator s group.
WARNING Connecting any production application that s accessible to users using
the SA Login ID and password is a fundamental mistake. Although
Getting and staying connected or not
there are rare exceptions, developers should never build or test applications using SA credentials. Let s visit each of these approaches in a bit more detail.
Using trusted or integrated security
Microsoft seems to support the trusted approach for most production applications. I also endorse it, but with a few caveats. You enable the trusted security option by including Integrated Security=SSPI; or Trusted_Connection=True; in the connection string. After you do, keep in mind that the connection inherits the rights granted to the user. The user might be a human with domain or system login rights or a service (like the ASP.NET service running under IIS). In the case of IIS services you need to determine the version of IIS you re using to host the application making the connection and the username IIS is using to log into SQL Server. I discuss this in the next section. If the user has limited rights in the database, the application might not be able to access all of the data objects (like stored procedures, tables, views, or functions) that it needs to function properly. In addition, if the user has super rights, the application might have access to more data objects than necessary. The reason I mention this is that trusted security may open your database to Trojan attacks, where a block of SQL is embedded surreptitiously that can be executed only when a user with sufficient rights runs the program. When you use this approach, consider that each time your code opens a connection, the user credentials are verified. This also applies to pooled connections (as discussed in Connection pooling later in this chapter). Trusted connections are enabled by default when you install SQL Server, and cannot be disabled.
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