This is beneficial for database vendors and users {TAIL ~ whose success} relies on {HEAD ~ their systems performance} 
This is beneficial for database vendors and users { TAIL ~ whose success } relies on { HEAD ~ their systems performance }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD