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Copy file name to clipboardExpand all lines: articles/cost-management-billing/reservations/reserved-instance-purchase-recommendations.md
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title: How Azure reservation recommendations are created
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description: Learn how Azure reservation recommendations are created for virtual machines.
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author: banders
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ms.author: banders
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ms.reviewer: yashar
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ms.service: cost-management-billing
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ms.devlang: na
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ms.topic: conceptual
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ms.tgt_pltfrm: na
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ms.workload: na
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ms.date: 01/28/2020
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ms.author: banders
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---
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# How reservation recommendations are created
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Azure reserved instance (RI) purchase recommendations are provided through Azure Consumption [Reservation Recommendation API](/rest/api/consumption/reservationrecommendations), [Azure Advisor](../..//advisor/advisor-cost-recommendations.md#buy-reserved-virtual-machine-instances-to-save-money-over-pay-as-you-go-costs), and through the reservation purchase experience in the Azure portal.
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The following steps define how recommendations are calculated:
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1. The recommendation engine evaluates the hourly usage for your resources in the given scope over the past seven, 30, and 60 days.
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Azure reserved instance (RI) purchase recommendations are provided through Azure Consumption [Reservation Recommendation API](/rest/api/consumption/reservationrecommendations), [Azure Advisor](../../advisor/advisor-cost-recommendations.md#buy-reserved-virtual-machine-instances-to-save-money-over-pay-as-you-go-costs), and through the reservation purchase experience in the Azure portal.
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The following steps define how recommendations are calculated:
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1. The recommendation engine evaluates the hourly usage for your resources in the given scope over the past 7, 30, and 60 days.
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2. Based on the usage data, the engine simulates your costs with and without reservations.
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3. The costs are simulated for different quantities, and the quantity that maximizes the savings is recommended.
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4. If your resources are shut down regularly, the simulation won't find any savings, and no purchase recommendation is provided.
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## Recommendations in Azure Advisor
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Reservation purchase recommendations for virtual machines are available in Azure Advisor. Keep in mind the following points:
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Reservation purchase recommendations for virtual machines are available in Azure Advisor. Keep in mind the following points:
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- Advisor has only single-subscription scope recommendations.
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- Recommendations that are calculated with a 30day look-back period are available in Advisor.
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- Recommendations that are calculated with a 30-day look-back period are available in Advisor.
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- If you purchase a shared-scope reservation, Advisor reservation purchase recommendations can take up to 30 days to disappear.
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## Other expected API behavior
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- When using a look-back period of seven days, you might not get recommendations when VMs are shut down for more than a day.
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## Next steps
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- Learn about [how the Azure reservation discount is applied to virtual machines](../manage/understand-vm-reservation-charges.md).
title: How a reservation discount is applied to Azure Database for MariaDB
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description: How a reservation discount is applied to Azure Database for MariaDB
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title: Understand reservation discount - Azure Database for MariaDB
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description: Learn how a reservation discount is applied to your Azure Database for MariaDB
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author: kummanish
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ms.author: manishku
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ms.service: cost-management-billing
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ms.devlang: na
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ms.topic: conceptual
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ms.tgt_pltfrm: na
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ms.workload: na
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ms.date: 10/17/2019
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ms.date: 02/13/2020
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---
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# How a reservation discount is applied to Azure Database for MariaDB
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After you buy an Azure Database for MariaDB reserved capacity, the reservation discount is automatically applied to MariaDB servers that match the attributes and quantity of the reservation. A reservation covers only the compute costs of your Azure Database for MariaDB. You're charged for storage and networking at the normal rates.
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After you buy an Azure Database for MariaDB reserved capacity, the reservation discount is automatically applied to MariaDB servers that match the attributes and quantity of the reservation. A reservation covers only the compute costs of your Azure Database for MariaDB. You're charged for storage and networking at the normal rates.
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## How reservation discount is applied
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A reservation discount is ***use-it-or-lose-it***. So, if you don't have matching resources for any hour, then you lose a reservation quantity for that hour. You can't carry forward unused reserved hours.</br>
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A reservation discount is ***use-it-or-lose-it***. So, if you don't have matching resources for any hour, then you lose a reservation quantity for that hour. You can't carry forward unused reserved hours.
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When you shut down a resource, the reservation discount automatically applies to another matching resource in the specified scope. If no matching resources are found in the specified scope, then the reserved hours are lost.
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## Discount applied to Azure Database for MariaDB
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The Azure Database for MariaDB reserved capacity discount is applied to running your MariaDB servers on an hourly basis. The reservation that you buy is matched to the compute usage emitted by the running Azure Database for MariaDB servers. For MariaDB servers that don't run the full hour, the reservation is automatically applied to other Azure Database for MariaDB matching the reservation attributes. The discount can apply to Azure Database for MariaDB servers that are running concurrently. If you don't have an MariaDB server that run for the full hour that match the reservation attributes, you don't get the full benefit of the reservation discount for that hour.
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The Azure Database for MariaDB reserved capacity discount is applied to running your MariaDB servers on an hourly basis. The reservation that you buy is matched to the compute usage emitted by the running Azure Database for MariaDB servers. For MariaDB servers that don't run the full hour, the reservation is automatically applied to other Azure Database for MariaDB matching the reservation attributes. The discount can apply to Azure Database for MariaDB servers that are running concurrently. If you don't have an MariaDB server that runs for the full hour that matches the reservation attributes, you don't get the full benefit of the reservation discount for that hour.
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The following examples show how the Azure Database for MariaDB reserved capacity discount applies depending on the number of cores you bought, and when they're running.
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***Example 1**: You buy an Azure Database for MariaDB reserved capacity for an 8 vCore. If you are running a 16 vCore Azure Database for MariaDB servers that matches the rest of the attributes of the reservation, you're charged the pay-as-you-go price for 8 vCore of your MariaDB server compute usage and you get the reservation discount for one hour of 8 vCore MariaDB server compute usage.</br>
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***Example 1**: You buy an Azure Database for MariaDB reserved capacity for an 8 vCore. If you are running a 16 vCore Azure Database for MariaDB servers that matches the rest of the attributes of the reservation, you're charged the pay-as-you-go price for 8 vCore of your MariaDB server compute usage and you get the reservation discount for one hour of 8 vCore MariaDB server compute usage.
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For the rest of these examples, assume that the Azure Database for MariaDB reserved capacity you buy is for a 16 vCore Azure Database for MariaDB and the rest of the reservation attributes match the running MariaDB servers.
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To understand and view the application of your Azure Reservations in billing usage reports, see [Understand Azure reservation usage](https://docs.microsoft.com/azure/billing/billing-understand-reserved-instance-usage-ea).
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## Need help? Contact us
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## Next steps
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If you have questions or need help, [create a support request](https://go.microsoft.com/fwlink/?linkid=2083458).
Copy file name to clipboardExpand all lines: articles/cost-management-billing/reservations/understand-reservation-charges-mysql.md
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title: How a reservation discount is applied to Azure Database for MySQL
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description: How a reservation discount is applied to Azure Database for MySQL
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title: Understand reservation discount - Azure Database for MySQL
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description: Learn how a reservation discount is applied to your Azure Database for MySQL servers.
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author: kummanish
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ms.author: manishku
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ms.service: cost-management-billing
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ms.devlang: na
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ms.topic: conceptual
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ms.tgt_pltfrm: na
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ms.workload: na
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ms.date: 02/13/2020
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---
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## Discount applied to Azure Database for MySQL
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The Azure Database for MySQL reserved capacity discount is applied to running your MySQL servers on an hourly basis. The reservation that you buy is matched to the compute usage emitted by the running Azure Database for MySQL servers. For MySQL servers that don't run the full hour, the reservation is automatically applied to other Azure Database for MySQL matching the reservation attributes. The discount can apply to Azure Database for MySQL servers that are running concurrently. If you don't have an MySQL server that run for the full hour that match the reservation attributes, you don't get the full benefit of the reservation discount for that hour.
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The Azure Database for MySQL reserved capacity discount is applied to running your MySQL servers on an hourly basis. The reservation that you buy is matched to the compute usage emitted by the running Azure Database for MySQL servers. For MySQL servers that don't run the full hour, the reservation is automatically applied to other Azure Database for MySQL matching the reservation attributes. The discount can apply to Azure Database for MySQL servers that are running concurrently. If you don't have an MySQL server that runs for the full hour that matches the reservation attributes, you don't get the full benefit of the reservation discount for that hour.
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The following examples show how the Azure Database for MySQL reserved capacity discount applies depending on the number of cores you bought, and when they're running.
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To understand and view the application of your Azure Reservations in billing usage reports, see [Understand Azure reservation usage](https://docs.microsoft.com/azure/billing/billing-understand-reserved-instance-usage-ea).
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## Need help? Contact us
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## Next steps
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If you have questions or need help, [create a support request](https://go.microsoft.com/fwlink/?linkid=2083458).
Copy file name to clipboardExpand all lines: articles/cost-management-billing/reservations/understand-reservation-charges-postgresql.md
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title: How a reservation discount is applied to Azure Database for PostgreSQL Single server
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description: How a reservation discount is applied to Azure Database for PostgreSQL Single server
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title: Understand reservation discount - Azure Database for PostgreSQL Single server
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description: Learn how a reservation discount is applied to Azure Database for PostgreSQL Single servers.
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author: kummanish
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ms.author: manishku
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ms.service: cost-management-billing
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ms.devlang: na
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ms.topic: conceptual
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ms.tgt_pltfrm: na
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ms.workload: na
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ms.date: 02/13/2020
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---
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## Discount applied to Azure Database for PostgreSQL Single server
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The Azure Database for PostgreSQL Single server reserved capacity discount is applied to running your PostgreSQL Single server on an hourly basis. The reservation that you buy is matched to the compute usage emitted by the running Azure Database for PostgreSQL Single server. For PostgreSQL Single servers that don't run the full hour, the reservation is automatically applied to other Azure Database for PostgreSQL Single server matching the reservation attributes. The discount can apply to Azure Database for PostgreSQL Single servers that are running concurrently. If you don't have an PostgreSQL Single server that run for the full hour that match the reservation attributes, you don't get the full benefit of the reservation discount for that hour.
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The Azure Database for PostgreSQL Single server reserved capacity discount is applied to running your PostgreSQL Single server on an hourly basis. The reservation that you buy is matched to the compute usage emitted by the running Azure Database for PostgreSQL Single server. For PostgreSQL Single servers that don't run the full hour, the reservation is automatically applied to other Azure Database for PostgreSQL Single server matching the reservation attributes. The discount can apply to Azure Database for PostgreSQL Single servers that are running concurrently. If you don't have an PostgreSQL Single server that run for the full hour that matches the reservation attributes, you don't get the full benefit of the reservation discount for that hour.
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The following examples show how the Azure Database for PostgreSQL Single server reserved capacity discount applies depending on the number of cores you bought, and when they're running.
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To understand and view the application of your Azure Reservations in billing usage reports, see [Understand Azure reservation usage](https://docs.microsoft.com/azure/billing/billing-understand-reserved-instance-usage-ea).
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## Need help? Contact us
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## Next steps
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If you have questions or need help, [create a support request](https://go.microsoft.com/fwlink/?linkid=2083458).
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