Question 6 :
Joining is the process of partitioning data according to predefined criteria.
Question 7 :
The role of the ETL process is to identify erroneous data and to fix them.
Question 8 :
Data in the data warehouse are loaded and refreshed from operational systems.
Question 9 :
Star schema is suited to online transaction processing, and therefore is generally used in operational systems, operational data stores, or an EDW.
Question 10 :
Periodic data are data that are physically altered once added to the store.