A computerized database management system for optimizing retrieval of {HEAD ~ data} from {TAIL ~ a database}, comprising: 
A computerized database management system for optimizing retrieval of { HEAD ~ data } from { TAIL ~ a database } , comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH