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Copy file name to clipboardExpand all lines: articles/cosmos-db/reserved-capacity.md
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ms.topic: conceptual
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ms.date: 03/11/2024
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ms.author: sidandrews
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ms.reviewer: jucocchi
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ms.reviewer: rosouz
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---
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# Optimize cost with reserved capacity in Azure Cosmos DB
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In this example, any provisioned throughput above 10,000 RU/s will be billed using your Pay-as-you-go rate. If provisioned throughput is below 10,000 RU/s in an hour, then the extra reserved capacity for that hour will be wasted.
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Please note that there is no limit to the number of reservations. You don't need to purchase all reservations in the same day.
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Please note that:
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* There is no limit to the number of reservations.
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* You don't need to purchase all reservations in the same day.
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* You can combine different reservations in the same purchase.
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## Reservations usage
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* Fixed discounts when you buy less than one million RU/s, using multiples of the 100 RU/s SKU. You can buy from 1 to 9999 units of this SKU.
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* Progressive discounts when you one million RU/s or more, using multiple units of the 1 to 30 millions SKUs. You can buy from 1 to 9999 units of these SKU.
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Please note that you can mix and match many SKUs in the same purchase.
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Please note that you can mix and match any reservations options and sizes in the same purchase.
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### Discounts for reservations smaller than one million RU/s
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### Fixed discounts reservations
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This option, using multiples of the 100 RU/s SKU, allows you to reserve any capacity between 100 and 999,900 RU/s since you can choose quantities between 1 and 9999 units of the 100 RU/s SKU.
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This option, using multiples of the 100 RU/s, allows you to reserve any capacity between 100 and 999,900 RU/s, with fixed discounts:
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|Reservation SKU | One-Year Single Discount | Three-Years Discount
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|Reservation | One-Year Single Discount | Three-Years Discount
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|---------|---------|---------|
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| 100 RU/s | 20% | 30% |
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| 100 Multi-master RU/s | 20% | 30% |
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### Discounts for reservations equal or bigger than one million RU/s
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### Progressive discounts reservations
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You can buy up to 9999 units of the one-million SKUs, with the variable discounts rates below:
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This option, using multiples of our bigger reservation sizes, allows you to reserve any capacity starting on 1,000,000 RU/s, with progressive discounts:
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| 30,000,000 RU/s | 43.4% | 58.3% |
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| 30,000,000 Multi-master RU/s | 48.4% | 63.3% |
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You can maximize savings with the biggest SKU for your scenario. Example: You need 2 million RU/s, one year term. If you purchase 2 units of the 1,000,000 RU/s SKU, your discount will br 27.0%. If you purchase 1 unit of the 2,000,000 RU/s SKU, you will have exactly the same reserved capacity, but a 28.5% discount.
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You can maximize savings with the biggest reservation for your scenario. Example: You need 2 million RU/s, one year term. If you purchase 2 units of the 1,000,000 RU/s SKU, your discount will be 27.0%. If you purchase 1 unit of the 2,000,000 RU/s SKU, you will have exactly the same reserved capacity, but a 28.5% discount.
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Please [create a support request](https://portal.azure.com/#blade/Microsoft_Azure_Support/HelpAndSupportBlade/newsupportrequest) to purchase any quantity of the reservations above.
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Please [create a support request](https://portal.azure.com/#blade/Microsoft_Azure_Support/HelpAndSupportBlade/newsupportrequest) to purchase any quantity of the reservations bigger than 1,000,000 RU/s.
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## Sample Scenario 1
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* 9000 units of the 100 RU/s SKU, paid monthly.
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* 500 units of the 100 RU/s SKU, paid upfront.
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## Existing reservations
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Existing auto-renew reservations may have these situations:
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* If the reservation size is smaller than one million RU/s, it will be renewed with multiples of the 100 RU/s SKU, with the same one-year or three-years term.
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* If the reservation size is equal or bigger than one million RU/s, there are no changes and it will renewed with the same settings.
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## Determine the required throughput before purchase
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We calculate purchase recommendations based on your hourly usage pattern. Usage over last 7, 30 and 60 days is analyzed, and reserved capacity purchase that maximizes your savings is recommended. You can view recommended reservation sizes in the Azure portal using the following steps:
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