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