More particularly, a minimum value of the index performance indicator is determined by the preferred embodiment of the present invention and is the minimum number of index entries that must be evaluated during a search for {HEAD ~ a geometric shape} associated with {TAIL ~ a spatial database} 
associated with
More particularly , a minimum value of the index performance indicator is determined by the preferred embodiment of the present invention and is the minimum number of index entries that must be evaluated during a search for { HEAD ~ a geometric shape } associated with { TAIL ~ a spatial database }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL