The document provides an overview of data warehousing and discusses its history, purpose, and key definitions. A data warehouse stores diverse data from multiple sources in a single repository for analysis and decision making. It differs from operational databases by being optimized for queries rather than transactions, containing historical rather than current data, and supporting strategic rather than operational needs. The need for data warehousing arose from an "information crisis" as organizations struggled to convert growing volumes of heterogeneous data into useful information to guide strategic decisions.

1. Data Warehousing/Mining Introduction

3. Data Warehouse Evolution TIME 2000 1995 1980 1960 1975 Information- Based Management Data Revolution “ Middle Ages” “ Prehistoric Times” Relational Databases PC’s and Spreadsheets End-user Interfaces 1st DW Article DW Confs. Vendor DW Frameworks Company DWs “ Building the DW” Inmon (1992) Data Replication Tools 1985 1990

11. Summary Operational Systems Data Warehouse Population Data Warehouse Business Information Interface

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