Implementing Slowly Changing Dimensions in Postgres
summary
Reviews six SCD patterns and argues type six is the most practical, then shows a working Postgres design that stores validity as a daterange, uses the btree_gist extension for a uniqueness constraint that prevents overlapping ranges, and keeps complex attributes in JSONB. Demonstrates window functions to detect gaps, partitioning by end date for archiving, and options for the current flag (sentinel infinity, partial index, or timestamp-in-range). Shows the approach reduces application code and performs well.
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chapters (5)
- 0:00Introduction
- 1:53Slowly changing dimensions overview
- 6:54Type six SCD in Postgres
- 13:53Postgres features for SCD
- 21:07Q&A
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