Defines the name of the local instance of SQL Server. When the computer hosting SQL Server is renamed, use sp_addserver to inform the instance of the SQL Server Database Engine of the new computer name. This procedure must be executed on all instances of the Database Engine hosted on the computer. The instance name of the Database Engine cannot be changed.
Is the name of the server. Server names must be unique and follow the rules for Microsoft Windows computer names, although spaces are not allowed. server is sysname, with no default.
When multiple instances of SQL Server are installed on a computer, an instance operates as if it is on a separate server. Specify a named instance by referring to server as servername\instancename.
[ @local = ] 'LOCAL'
Specifies that the server that is being added as a local server. @local is varchar(10), with a default of NULL. Specifying @local as LOCAL defines @server as the name of the local server and causes the @@SERVERNAME function to return the value of server.
SQL Server Setup sets this variable to the computer name during installation. By default, the computer name is the way users connect to an instance of SQL Server without requiring additional configuration.
The local definition takes effect only after the Database Engine is restarted. Only one local server can be defined in each instance of the Database Engine.
[ @duplicate_ok = ] 'duplicate_OK'
Specifies whether a duplicate server name is allowed. @duplicate_OK is varchar(13), with a default of NULL. @duplicate_OK can only have the value duplicate_OK or NULL. If duplicate_OK is specified and the server name that is being added already exists, no error is raised. If named parameters are not used, @local must be specified.