About this document
Understanding Slowly Changing Dimensions by 9391509391 is a document available to read on EtoBox.
Slowly changing dimensions (SCDs) refer to dimensions in a data warehouse that change over time. There are three types of SCDs: Type 1 replaces old data with new data, losing history; Type 2 adds a new record to track both old and new data; Type 3 uses additional columns to track original and current attribute values along with effective dates. Type 1 is easiest but loses history, while Type 2 and 3 maintain more history but require more storage or processing. The document discusses the characteristics and
- Author
- 9391509391
- Language
- EN