One of the key differences between operational systems and data warehouses is:

Operational systems focus on data quality: data warehouses focus on datasecurity

Operational systems focus on historical data; data warehouses contain currentdata

Operational systems are available 24x7; data warehouses are available duringbusiness hours

Operational systems focus on current data; data warehouses contain historicaldata

Operational systems focus on business processes: data warehouses focus onbusiness strategies