How to estimate RU/s in Provisioned mode?

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How to estimate RU/s in Provisioned mode?

RTG-1064 40

Hi,

I’m currently using Azure Cosmos DB in Serverless mode, and I’m considering migrating to Provisioned throughput mode. Is there any method to better estimate the RU/s I’ll need? Since usage can vary.

e.g., from serverless mode usage track

Appreciate any suggestions or resources you can share.

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Answer 1

Patchfox 4,096

Hi, a first option could be the azure Cosmos monitoring solution or Insights, which can already provide initial indications of past usage rates over a period of time.

If you want even more detail or your own calculations, you should activate the diagnostic logs for RU.

This enables more complex data queries via log analytics.

https://learn.microsoft.com/en-us/azure/cosmos-db/monitor?tabs=resource-specific-diagnostics

If the reply was helpful, please don’t forget to upvote or accept it as an answer, thank you!

RTG-1064 40 Reputation points

2025-06-14T14:19:58.51+00:00

Hi @Patchfox ,

I can see the total Request Units (RUs) from Monitoring -- Metrics in Cosmos DB, but I’m not sure what value I should plug into the Azure Pricing Calculator, should I go with the peak RU/s or the average? And should the unit be per second?

Any suggestions on how to estimate this properly when planning to switch to Provisioned throughput?

Also, I noticed there are two options under Provisioned: Standard (manual) and Autoscale. Do you happen to know how the pricing differs between them or have any experience using both?

Thank you.

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How to estimate RU/s in Provisioned mode?

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