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