Defining Data Warehouse Concepts and Terminology.

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Presentation transcript:

Defining Data Warehouse Concepts and Terminology

Definition of a Data Warehouse “ An enterprise structured repository of subject-oriented, time-variant, historical data used for information retrieval and decision support. The data warehouse stores atomic and summary data.” Oracle Data Warehouse Method

Data Warehouse Properties Data Warehouse Integrated Time Variant Non Volatile Subject Oriented

Subject-Oriented Data is categorized and stored by business subject rather than by application Equity Plans Shares Customer financial information Savings Insurance Loans OLTP Applications Data Warehouse Subject

Integrated OLTP Applications Savings Current accounts Loans Data Warehouse Data on a given subject is defined and stored once. Customer

Time-Variant Data is stored as a series of snapshots, each representing a period of time

Nonvolatile Typically data in the data warehouse is not updated or delelted. Insert Update Delete Read Operational Warehouse Load

Changing Data Warehouse Database First time load Refresh Operational Database