1. What is RU/s Calculation for Azure Cosmos DB?

RU/s (Request Units per second) calculation helps determine the required capacity for Azure Cosmos DB based on read and write operations. It's essential for proper capacity planning and cost estimation.

2. How Does the Calculator Work?

The calculator uses the RU/s formula:

Where:

• \( Reads\ per\ sec \) — Number of read operations per second
• \( Read\ Cost \) — Request units consumed per read operation
• \( Writes\ per\ sec \) — Number of write operations per second
• \( Write\ Cost \) — Request units consumed per write operation

Explanation: The equation calculates total request units required per second by summing the cost of read and write operations.

3. Importance of RU/s Calculation

Details: Accurate RU/s calculation is crucial for proper capacity provisioning, performance optimization, and cost management in Azure Cosmos DB deployments.

4. Using the Calculator

Tips: Enter the number of read and write operations per second along with their respective RU costs. All values must be non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are Request Units in Azure Cosmos DB?
A: Request Units (RUs) represent the computational cost of database operations. 1 RU corresponds to the cost of reading a 1KB item.

Q2: How do I determine Read/Write Costs?
A: Read cost typically ranges from 1-5 RUs for point reads. Write costs are usually higher, around 5-10 RUs per 1KB item.

Q3: Can RU/s be auto-scaled in Azure Cosmos DB?
A: Yes, Azure Cosmos DB supports automatic scaling of RU/s based on workload patterns, within configured maximum limits.

Q4: What factors affect RU consumption?
A: Item size, indexing policy, consistency level, and query complexity all impact RU consumption for operations.

Q5: How often should I review my RU/s provisioning?
A: Regular monitoring and adjustment is recommended, especially after application changes or during seasonal traffic variations.