1. What is Cosmos DB Capacity Calculator?

The Cosmos DB Capacity Calculator estimates the request units per second (RU/s) needed for Azure Cosmos DB throughput based on the number of operations and the RU cost per operation.

2. How Does the Calculator Work?

The calculator uses the RU/s formula:

Where:

• \( \text{Number of Operations} \) — Operations per second
• \( \text{RU per Operation} \) — Request units consumed per operation

Explanation: This calculation helps determine the required throughput capacity for your Cosmos DB deployment based on expected workload.

3. Importance of RU/s Calculation

Details: Accurate RU/s estimation is crucial for proper capacity planning, cost optimization, and ensuring optimal performance for your Cosmos DB applications.

4. Using the Calculator

Tips: Enter the expected number of operations per second and the average RU cost per operation. Both values must be non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are Request Units (RUs) in Cosmos DB?
A: Request Units represent the cost of database operations in Cosmos DB, including reads, writes, and queries.

Q2: How do I determine the RU cost per operation?
A: The RU cost varies based on operation complexity, document size, and indexing. You can measure actual RU consumption using Cosmos DB metrics.

Q3: What factors affect RU consumption?
A: Document size, indexing policy, query complexity, consistency level, and operation type all impact RU consumption.

Q4: Should I include peak or average workload?
A: For production systems, plan for peak workload to ensure performance during high traffic periods.

Q5: Can I adjust RU/s after deployment?
A: Yes, Cosmos DB allows you to scale RU/s up or down based on changing workload requirements.