Q15 Cosmos DB Domain 2 · 25–30% of exam

A Cosmos DB container has 10,000 RU/s provisioned. A bulk write of 1 million documents is required. What happens if the operation exceeds the RU/s limit?

  1. A Documents are silently dropped
  2. B Cosmos DB throws a 429 (Too Many Requests) error; the SDK retries after the Retry-After header interval (correct answer)
  3. C The container autoscales to handle the burst
  4. D Writes queue indefinitely

Shortcut: Exceeding provisioned throughput results in HTTP 429 errors with a Retry-After header. The Cosmos DB SDK handles retries automatically. Use bulk operations with retries for large imports.