Вопрос по Restore Database "master"

create procedure sp_restore_link_login_user
     @login sysname     -- login for SQL Server name Win_NT
    ,@user_name sysname -- User name for my Database
    ,@name_my_DB sysname    -- name my Database
as
 
set @login = HOST_NAME()+' '+@login
 
-- add login for SQL Server ------------------------------------------
 
if not exists (select sid from master.dbo.syslogins where loginname=@login)
begin
    declare @returncode int
    set @returncode = 0
    -- add Login Win_NT
    execute @returnCode=master..sp_grantlogin @login -- add login
    if (@@ERROR <> 0 OR @ReturnCode <> 0) goto end_
end
    --  set default database
    execute @returnCode=master..sp_defaultdb @login, @name_my_DB
    if (@@ERROR <> 0 OR @ReturnCode <> 0) goto end_
 
-- Restore Link between User and Login -------------------------------
declare @str nvarchar(2048), @count int
set @str = 
N'select @col=count(*) from ['+@name_my_DB+']..sysusers where name=@usr'
exec sp_executesql @str, N'@usr varchar(128), @col int out', @user_name, @col=@count out
 
if @count != 0
begin
    EXEC master..sp_configure 'allow updates', '1'
    RECONFIGURE WITH OVERRIDE
 
    set @str = 
    N'update ['+@name_my_DB+']..sysusers set sid = (select sid from master.dbo.syslogins where loginname='''+@login+''')
    ,updatedate = getdate() where name = '''+@user_name+''''
    execute (@str)
 
    EXEC master..sp_configure 'allow updates', '0'
    RECONFIGURE WITH OVERRIDE
end
else
    print ('User '''+@user_name+''' not exists in '''+@name_my_DB+'''')
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end_: