A BI dashboard queries a gold aggregation — complex joins plus a GROUP BY over billions of rows — on every page load, and each query takes about 40 seconds. The data only needs to be current as of the last refresh, and the team refreshes analytics hourly. They want a Unity Catalog object whose results are precomputed and stored so that dashboard reads are fast. Which object should the dashboard query?
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Correct answer: A materialized view, refreshed hourly — precomputed and stored for fast reads
Reference: https://docs.databricks.com/aws/en/ldp/concepts/materialized-views
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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 (B): A materialized view, refreshed hourly — precomputed and stored for fast reads
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