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Accepted answer
Idempotent writes with merge keys saved us during backfills.
This worked in dev on sample data but fails at full volume. Details:
Context: Covering index worth it for wide dimension table?
Happy to share schema snippets or metrics if useful.
Accepted answer
Idempotent writes with merge keys saved us during backfills.
Small nit: the broadcast hint gets ignored once the table is over threshold, check the UI to confirm.
Could you share a sketch of the salting logic?
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