The OS currently known as "IBM i" (fka os400) is in essence "DB2 OS". DB2 is available as a "standalone" RDBMS also, and they rename it every decade or so for marketing
its called IBM i these days. DB2 originally didnt have a name because it was part of OS/400... Later DB2 name was applied and standalone versions released. "IBM i" is basically DB2OS if we want to talk about flipping the paradigm
this makes me think of the IBM i (fka OS400) Operating System, where the DB integration is so tight in with the OS. Originally DB2 did not have a name because it was so tightly part of an OS, it didnt need one until it came time to compare it to ther dbs and make standalone offerings of it. So therefore "IBM i" is basically DB2OS then?