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Extraction, Transformation, and Loading (ETL)
- Data extraction
- get data from multiple, heterogeneous, and external sources
- Data cleaning
- detect errors in the data and rectify them when possible
- Data transformation
- convert data from legacy or host format to warehouse format
- Load
- sort, summarize, consolidate, compute views, check integrity, and build indicies and partitions
- Refresh
- propagate the updates from the data sources to the warehouse
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