Please look into the database ROLES for MSDB. There a 3 that are totally different than they are in any other database. They'll be obvious to you. Then, look them up to see what each does. for privs.
RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row. First step towards the paradigm shift of writing Set Based code: ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.
Change is inevitable... Change for the better is not.