Configuration Options (SQL Server Express)

Use the Configuration Options page to generate a separate instance of the Database Engine for users without administrator permissions, and to add users to the administrator role.


  • Enable User Instances
    Default is on. To disable the functionality of enabling user instances, clear the check box.

    The user instance, also known as a child or client instance, is an instance of SQL Server that is generated by the parent instance (the primary instance that runs as a service, such as SQLExpress) on behalf of a user. The user instance runs as a user process under the security context of that user. The user instance is isolated from the parent instance and any other user instances running on the computer. The user instance feature is also referred to as “Run As Normal User” (RANU).

  • Add User to the SQL Server Administrator role
    Default is not on. To add the current setup user to the SQL Server Administrator role, select the check box.

    Windows Vista users that are members of BUILTIN\Administrators are not automatically added to the sysadmin fixed server role when they connect to SQL Server Express. Only Windows Vista users that have been explicitly added to a server-level administrator role can administer SQL Server Express. Any member of the Built-In\Users group can connect to the SQL Server Express instance, but they will have limited permissions to perform database tasks. For this reason, users whose SQL Server Express privileges are inherited from BUILTIN\Administrators and Built-In\Users in previous releases of Windows must be explicitly granted administrative privileges in instances of SQL Server Express running on Windows Vista.

    To make any changes to the user roles after this installation program ends, use the SQL Server 2005 Surface Are Configuration Tool (SQLSAC.exe). To update the list of users in the SQL Server System Administrator role, click the Add New Administrator link.

    Ensure that the User to provision field lists the DomainName\UserName of the user whose permissions should be updated. Select the role to be updated from the list of SQL Server instances in the Available privileges pane, and then click the right arrow. To add the user to all available roles for all available instances of SQL Server instances and all available roles, click the double right arrow.

    To implement the changes when your selections are complete, click OK. To end the tool without making changes, click Cancel.

Command Line Options

The ENABLERANU switch is used to configure user instances.

To turn user instances off:


To turn user instances on (default):



User instances apply only to SQL Server 2005 Express Edition editions.

The ADDUSERASADMIN switch is used to add the current setup user to the SQL Server Administrator role.

To add the current setup user to the Administrator role:


To not add the current setup user to the Administrator role:



This command line option only exists for SQL Server 2005 Express Edition editions.

See Also


User Instances for Non-Administrators

Help and Information

Getting SQL Server 2005 Assistance