[Db2 LUW] Source for arbitrary record

I sometimes are in need for a source of an arbitrary record, e. g. to test some function. In Oracle you can use DUAL. In Db2 LUW (to make it clear what DB I am referring to, I know LUW is officially not used anymore by IBM) there is a compatibility vector thing which provides DUAL as well. But it is not installed, switched on, activated or whatever one has to do to make it usable, one can use SYSIBM.SYSDUMMY1.