$4-$$$ No AI and Copying please $$

$4)$ Data Warehousing and Active Databases

What are the advantages and disadvantages of lightly versus heavily summarized information? Consider a data warehouse that contains data on customers and products for all locations of a major retail store. What would be an example of lightly summarized and heavily summarized information?

Explain the Event$-$Condition$-$Action paradigm used in active databases. What advantages do active databases have over previously used techniques like polling $($loosely$-$coupled systems$)?$