Chendong Zou XPS: A High Performance Parallel Database Server. 21-26 1997 20 IEEE Data Eng. Bull. 2 DEBU/97JUN-CD.PDF db/journals/debu/debu20.html#Zou97 db/journals/debu/Zou97.html journals/sigmod/DeWittG90 journals/tkde/Graefe94 ... journals/debu/Stonebraker86