Building the Data Warehouse

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operational data data used to support the daily processing a company does.

operational data store (ODS) a hybrid structure designed to support both operational transaction processing and analytical processing.

operations the department charged with the running of the computer.

optical disk a storage medium using lasers as opposed to magnetic devices. Optical disk is typically write only, is much less expensive per byte than magnetic storage, and is highly reliable.

overflow (1) the condition in which a record or a segment cannot be stored in its home address because the address is already occupied. In this case, the data is placed in another location referred to as overflow; (2) the area of DASD where data is sent when the overflow condition is triggered.

ownership the responsibility for updating operational data.

page (1) a basic unit of data on DASD; (2) a basic unit of storage in main memory.

parameter an elementary data value used as a criterion for qualification, usually of data searches or in the control of modules.

repeating groups a collection of data that can occur several times within a given record occurrence.

rolling summary a form of storing archival data where the most recent data has the most details stored, and data that is older has fewer details stored.

scope of integration the formal definition of the boundaries of the system being modeled.

SDLC system development life cycle; the classical operational system development life cycle that typically includes requirements gathering, analysis, design, programming, testing, integration, and implementation.

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