What does a Request Unit (RU) represent in Cosmos DB?
- A CPU seconds consumed
- B A normalized unit of compute cost for a database operation (e.g., 1 RU = 1 KB document read) (correct answer)
- C Network bandwidth in MB
- D Memory allocation in MB
Shortcut: 1 RU is the cost of reading a 1 KB document. Writes, queries, and stored procedure calls consume varying RUs based on complexity, document size, and indexing.