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Databricks🟡IntermediateWhat the lakehouse actually is, how Delta Lake adds ACID transactions to cheap object storage, and the medallion architecture in practice.
Iceberg🟡IntermediateThe feature lists have converged. What still differs is metadata structure, catalog architecture, and engine support, and those are what decide which format fits your stack.
Databricks🟡IntermediateHow the _delta_log actually works: JSON commits, optimistic concurrency, checkpoints, deletion vectors, and the small-file problem nobody escapes.
