Date archive for December, 2008
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Degenerate Dimensions in Datamarts
Not all dimensions are created equal. Â A typical dimension is defined by a table that holds the reference data that is being joined to the fact data. Â So in the fact table, for example, we have the product ID, or the product code, and in the product dimension table we have a single row for […]
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Easy to use ETL
As We’ve been creating Datamartist, we’ve been trying to avoid using acronyms to describe what it is, but when I’m talking to people who have a background in data warehousing, I only have to say “its an easy to use desktop ETL tool”, and suddenly they know what I am talking about. An Extract, Transform, Load (ETL) tool is […]
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Data Warehouse vs Data Mart
Very often, the question is asked- what’s the difference between a data mart and a data warehouse- which of them do I need? Data warehouse or Data Mart? Data Warehouse: Holds multiple subject areas Holds very detailed information Works to integrate all data sources Does not necessarily use a dimensional model but feeds dimensional models. […]

