Data should be in a consistent state when it is extracted from the source system. More to the point, the information in a data warehouse represents a snapshot of corporate information, so that the user is looking at a single, consistent, version of the truth. Source data should be extracted only at a point where […]
Data extraction takes data from source systems and makes it available to the data warehouse; data load takes extracted data and loads it into the data warehouse. Data in operational systems is held in a form suitable for that system. When we extract data from a physical database, whatever form it is held in, the […]
The processes required to populate the warehouse focus on extracting the data, cleaning it up, and making it available for analysis. This is typically done on a daily basis after the close of the business day. A common misconception is that data warehouses are read-only systems. In fact, one of the key challenges for a […]
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