{HEAD ~ A relational database management system} which determines {TAIL ~ the shareable status} of an executable object in an cache 
{ HEAD ~ A relational database management system } which determines { TAIL ~ the shareable status } of an executable object in an cache
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH