Abstract
The genesis of much data is the operational environment. As transactions are executed, data are generated as a by-product. Response time is essential for online transaction systems. Good response time is achieved by adherence to the “standard work unit.” The SWU allows corporations to run many transactions and maintain consistent, good response time. The structure of operational data is achieved by the creation of a data model. The data model is built at several levels—the high level is the ERD, the midlevel is the dis, and the low level is the physical model. An important part of the operational environment is the component known as metadata. It is metadata that describe the structure and content of operational data.
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