It brings forward how to effect cost forecast, cost control. cost accounting and analysis so as to answer the purpose of cost control.

If the answer is "No," then ask yourself, "what purpose do these behaviors serve and what would be a more effective way of communicating the feelings that these behaviors are expressing?"

Another purpose is to improve performance based on partition elimination when the DB2 query optimizer determines that only a subset of the partitions need to be examined to answer as particular query.