ETL-based data warehousing
The typical extract, transform, load (ETL)-based data warehouse uses staging, data integration, and access layers to house its key functions. The … See more

A data warehouse maintains a copy of information from the source transaction systems. This architectural complexity provides the opportunity to:
• Integrate … See more

A data mart is a simple form of a data warehouse that is focused on a single subject (or functional area), hence they draw data from a limited number of sources such as … See more

Facts
A fact is a value, or measurement, which represents a fact about the managed entity or system.
Facts, as reported by the reporting entity, are said to be at raw level; e.g., in a mobile telephone … See more

The environment for data warehouses and marts includes the following:
• Source systems that provide data to the warehouse or mart; See more

The concept of data warehousing dates back to the late 1980s when IBM researchers Barry Devlin and Paul Murphy developed the "business data warehouse". In essence, the … See more

Bottom-up design
In the bottom-up approach, data marts are first created to provide reporting and analytical capabilities for specific business processes. … See more