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A medallion architecture is a data design pattern used to logically organize data in a lakehouse, with the goal of incrementally and progressively improving the structure and quality of data as it flows through each layer of the architecture (from Bronze ⇒ Silver ⇒ Gold layer tables). Medallion architectures are sometimes also referred to as "multi-hop" architectures.
Change Data Feed (CDF) feature allows Delta tables to track row-level changes between versions of a Delta table. When enabled on a Delta table, the runtime records “change events” for all the data written into the table. This includes the row data along with metadata indicating whether the specified row was inserted, deleted, or updated.
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