An auditor must verify catalog.finance.ledger as it stood 20 days ago. The team runs the time travel query for that snapshot, but it fails with a FILE_NOT_FOUND exception pointing at a data file. The table is vacuumed weekly with the default retention settings, and OPTIMIZE also runs regularly. What is the most likely cause of the failure?
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Correct answer: VACUUM removed data files older than the default 7-day retention, making older snapshots unreadable
Reference: https://docs.databricks.com/aws/en/delta/best-practices
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02 — The Myelin Layer · Canonical Discussion
Where the exam tries to trick you — and how those who passed solved it.
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Official Answer (C): VACUUM removed data files older than the default 7-day retention, making older snapshots unreadable
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