Data Vault

Concepts: dmDataVault

Hubs, Links, and Satellites Data Vault is a modeling methodology designed for agility and auditability in enterprise data warehouses. It decomposes data into three types of tables: Hubs (business keys), Links (relationships between hubs), and Satellites (descriptive attributes with history). The structure is more complex than star schemas but handles change more gracefully. Hubs store only the business key (customer_id, product_sku) and a hash key. Links store the relationship between two hubs (customer_X_ordered_product_Y). Satellites store the descriptive attributes (customer_name, customer_address) with effective dates for full history. Data Vault separates structure (hubs and links) from content (satellites). Adding a new attribute means adding a satellite, not modifying the hub or lin