Abstract
A data warehouse (DW) is a collection of technologies
aimed at enabling the decision maker to make better and
faster decisions. Data warehouses differ from operational
databases in that they are subject oriented, integrated, time
variant, non volatile, summarized, larger, not normalized, and
perform OLAP. The generic data warehouse architecture
consists of three layers (data sources, DSA, and primary data
warehouse). During the ETL process, data is extracted from
an OLTP databases, transformed to match the data warehouse
schema, and loaded into the data warehouse database
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