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