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