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Databricks interview themes
What people report studying for — not a take-home dump. Last editorial update 2026-08-05.
Delta logUnity CatalogPhoton / AQE
Rounds you should expect
Lakehouse
What _delta_log does on a failed write. OPTIMIZE vs VACUUM. Liquid clustering vs ZORDER.
Governance
catalog.schema.table, grants, and why path-based tables have no lineage.
Recently added questions
2026-07-28 · VACUUM vs Time Travel
Someone ran VACUUM 0 HOURS on a gold table. What is actually broken?
In-flight readers and every snapshot older than now. VACUUM deletes files. OPTIMIZE does not. Restore is gone if the files are gone.