Corporate Information Factory (CIF) Resources by Bill Inmon, Inmon Data Systems

The Operational Data Store (ODS) Classes

There are four types of ODS:

class I - where the time lag from execution in the operational environment until the moment that the update is reflected in the ODS is synchronous (i.e., less than a second)
class II - where the time lag from execution in the operational environment until the moment that the update is reflected in the ODS is in the two to four hour range (i.e., in a store and forward mode)
class III - where the time lag from execution in the operational environment until the moment that the update is reflected in the ODS is overnight (i.e., in a batch mode)
class IV - where the data is processed in the data warehouse and fed back to the ODS in an aggregated manner