Может, это немного поможет тебе:

BOL:

SQL Server Startup Options
When you install Microsoft® SQL Server™, SQL Server Setup writes a set of default startup options for SQL Server in the Microsoft Windows® Registry. You can use these startup options to specify an alternate master database file, master database log file, or error log file.

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-sregistry_key Starts SQL Server using an alternate set of startup parameters stored in the Registry under the key registry_key. This option, which can be run only from the command prompt, lets you select from multiple previously defined startup configurations. You could, for example, create an alternate Registry key to start SQL Server in single-user mode. (This applies only to the Server subkey.)

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