If the benefit for a given database is larger than the recorded benefit in the shared memory, then the given database will replace the benefit data recorded in shared memory with its own benefit data , and that database then knows that it has the highest relative need for {HEAD ~ memory} in {TAIL ~ the data processing system} 
If the benefit for a given database is larger than the recorded benefit in the shared memory , then the given database will replace the benefit data recorded in shared memory with its own benefit data , and that database then knows that it has the highest relative need for { HEAD ~ memory } in { TAIL ~ the data processing system }
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