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DefinitionA data warehouse is a centralized store of structured, historical data — typically modeled with facts and dimensions using a star or snowflake schema — organized specifically to support analytical querying and reporting, as opposed to the transaction...

When a data warehouse is genuinely neededBI/reporting — ad hoc slicing across dimensions (region, time, product) at speed; row-stores choke on this at scale.Historical/point-in-time analysis — cohort retention, trend analysis, "what did exposure look like on a...