Grain and duration have a direct impact on the size of tables.

Grain and duration have a 'direct impact' on the size of fact tables.

Explanation:

In a fact table, the grain denotes the degree of details put in the fact table. A grain already holds a lot of data owing to its construction. It is constructed of numerous distinct yet interrelated elements.These elements are known as the primary element, the foreign element, and the other big and small elements. More the grain and duration, more is the size of the fact tables.