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Slowly Changing Dimensions ( SCD Type I/II/III )

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Slowly Changing Dimensions (SCD’s)

SCD is a dimension which captures the changes that occur over a period of time.

  • Type I – Contains only current data. Change in source is overwritten
  • Type II-Maintains complete history + Current data
  • Type III-Partial (recent) history + Current data
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In OLTP

OLTP

In DWH

DWH

  • Active record is where end date is null
  • History
  • Active status(Active record – Max Version)
  • Change No (Version)
  • Duration (Time stamp)
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Ravindra Savaram
About The Author

Ravindra Savaram is a Content Lead at Mindmajix.com. His passion lies in writing articles on the most popular IT platforms including Machine learning, DevOps, Data Science, Artificial Intelligence, RPA, Deep Learning, and so on. You can stay up to date on all these technologies by following him on LinkedIn and Twitter.


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