In this paper, we focus on two different perspectives to improve ETL tool, a reduce the data set which ETL process deals with, b improve performance of ETL process per time unit.

The other way to think about it is divergence is the source rate, it is the amount of fluid that is being inserted into the system, that is being pumped into the system per unit time per unit area.

An excellent metric for volatility is gross change per unit time, with the overall assessment being the trend over time for this metric.