d924f03e_sselaer_Data_Warehouse_Project__data_warehousing_systems
[operational systems] Operational systems are generally optimized to perform fast inserts and updates of relatively small volumes of data. [data warehousing systems] 
Data warehousing systems are generally optimized to perform fast retrievals of relatively large volumes of data.
Operational Systems vs. Data Warehousing - Rensselaer Data Warehouse Project
data warehousing systems