The primary key of a dimension table should be a composite of foreign keys referencing the corresponding fact tables to ensure correct data granularity.

Dimensions are optimized for fast joins with the fact table.

Dimensions are designed to store textual, denormalized, and descriptive attributes that provide context to the measurable values in the fact table.

Dimensions are optimized for high volumes of transactional data and are updated more frequently than fact tables to reflect operational changes in real time.