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Pricing for Azure Cosmos DB for PostgreSQL

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APPLIES TO: Azure Cosmos DB for PostgreSQL (powered by the Citus database extension to PostgreSQL)

For the most up-to-date general pricing information, see the service pricing page. To see the cost for the configuration you want, the Azure portal shows the monthly cost on the Configure tab based on the options you select. If you don't have an Azure subscription, you can use the Azure pricing calculator to get an estimated price. On the Azure pricing calculator website, select Add items, expand the Databases category, and choose Azure Cosmos DB for PostgreSQL to customize the options.

Prepay for compute resources with reserved capacity

Azure Cosmos DB for PostgreSQL helps you save money by prepaying for compute resources compared to pay-as-you-go prices. With Azure Cosmos DB for PostgreSQL reserved capacity, you make an upfront commitment on cluster for a one- or three-year period to get a significant discount on the compute costs. To purchase Azure Cosmos DB for PostgreSQL reserved capacity, you need to specify the Azure region, reservation term, and billing frequency.

You don't need to assign the reservation to specific clusters. An already running cluster or ones that are newly deployed automatically get the benefit of reserved pricing. By purchasing a reservation, you're prepaying for the compute costs for one year or three years. As soon as you buy a reservation, the Azure Cosmos DB for PostgreSQL compute charges that match the reservation attributes are no longer charged at the pay-as-you-go rates.

A reservation doesn't cover software, networking, or storage charges associated with the clusters. At the end of the reservation term, the billing benefit expires, and the clusters are billed at the pay-as-you go price. Reservations don't autorenew. For pricing information, see the Azure Cosmos DB for PostgreSQL reserved capacity offering.

You can buy Azure Cosmos DB for PostgreSQL reserved capacity in the Azure portal. Pay for the reservation up front or with monthly payments. To buy the reserved capacity:

  • You must be in the owner role for at least one Enterprise Agreement (EA) or individual subscription with pay-as-you-go rates.
  • For Enterprise Agreement subscriptions, Add Reserved Instances must be enabled in the EA Portal. Or, if that setting is disabled, you must be an Enterprise Agreement admin on the subscription.
  • For the Cloud Solution Provider (CSP) program, only the admin agents or sales agents can purchase Azure Cosmos DB for PostgreSQL reserved capacity.

For information on how Enterprise Agreement customers and pay-as-you-go customers are charged for reservation purchases, see:

Determine the right cluster size before purchase

The size of reservation is based on the total amount of compute used by the existing or soon-to-be-deployed coordinator and worker nodes in clusters within a specific region.

For example, let's suppose you're running one cluster with 16 vCore coordinator and three 8 vCore worker nodes. Further, let's assume you plan to deploy within the next month an additional cluster with a 32 vCore coordinator and two 4 vCore worker nodes. Let's also suppose you need these resources for at least one year.

In this case, purchase a one-year reservation for:

  • Total 16 vCores + 32 vCores = 48 vCores for coordinator nodes
  • Total 3 nodes x 8 vCores + 2 nodes x 4 vCores = 24 + 8 = 32 vCores for worker nodes

If high availability (HA) is enabled on the cluster, number of vCores used by that cluster doubles. For instance, if HA is going to be enabled on a cluster with 16 vCores on coordinator and two 8 vCore worker nodes, calculation would be as follows:

  • Coordinator: 16 vCores x 2 (HA) = 32 vCores
  • Worker nodes: 8 vCores x 2 nodes x 2 (HA) = 32 vCores

Calculation for each cluster read replica needs to be done separately and purchased in the region where that replica is located. Each cluster read replica has compute that can be configured independently of its primary cluster and can be located in any supported region.

If you need to purchase reserved capacity for Azure Cosmos DB for PostgreSQL single nodes, you would need to select coordinator vCores.

Note

You can prepay for compute resources on Azure Cosmos DB for PostgreSQL single nodes with regular compute but reservations are not available for single nodes with burstable compute.

Buy Azure Cosmos DB for PostgreSQL reserved capacity

  1. Sign in to the Azure portal.
  2. Select All services > Reservations.
  3. Select Add. In the Purchase reservations pane, select Azure Cosmos DB for PostgreSQL to purchase a new reservation for your PostgreSQL databases.
  4. Select the Azure Cosmos DB for PostgreSQL Compute type to purchase, and click Select.
  5. Review the quantity for the selected compute type on the Products tab.
  6. Continue to the Buy + Review tab to finish your purchase.

The following table describes required fields.

Field Description
Subscription The subscription used to pay for the Azure Cosmos DB for PostgreSQL reserved capacity reservation. The payment method on the subscription is charged the upfront costs for the Azure Cosmos DB for PostgreSQL reserved capacity reservation. The subscription type must be an Enterprise Agreement (offer numbers: MS-AZR-0017P or MS-AZR-0148P) or an individual agreement with pay-as-you-go pricing (offer numbers: MS-AZR-0003P or MS-AZR-0023P). For an Enterprise Agreement subscription, the charges are deducted from the enrollment's Azure Prepayment (previously called monetary commitment) balance or charged as overage. For an individual subscription with pay-as-you-go pricing, the charges are billed to the credit card or invoice payment method on the subscription.
Scope The vCore reservation's scope can cover one subscription or multiple subscriptions (shared scope). If you select Shared, the vCore reservation discount is applied to clusters running in any subscriptions within your billing context. For Enterprise Agreement customers, the shared scope is the enrollment and includes all subscriptions within the enrollment. For pay-as-you-go customers, the shared scope is all pay-as-you-go subscriptions created by the account administrator. If you select Management group, the reservation discount is applied to clusters running in any subscriptions that are a part of both the management group and billing scope. If you select Single subscription, the vCore reservation discount is applied to clusters in this subscription. If you select Single resource group, the reservation discount is applied to clusters in the selected subscription and the selected resource group within that subscription.
Region The Azure region that's covered by the Azure Cosmos DB for PostgreSQL reserved capacity reservation.
Term One year or three years.
Quantity The amount of compute resources being purchased within the Azure Cosmos DB for PostgreSQL reserved capacity reservation. In particular, the number of coordinator or worker node vCores in the selected Azure region that are being reserved and which will get the billing discount. For example, if you're running (or plan to run) clusters with the total compute capacity of 64 coordinator node vCores and 32 worker node vCores in the East US region, specify the quantity as 64 and 32 for coordinator and worker nodes, respectively, to maximize the benefit for all servers.

Cancel, exchange, or refund reservations

You can cancel, exchange, or refund reservations with certain limitations. For more information, see Self-service exchanges and refunds for Azure reservations.

vCore size flexibility

vCore size flexibility helps you scale up or down coordinator and worker nodes within a region, without losing the reserved capacity benefit.

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Next steps

The vCore reservation discount is applied automatically to the number of clusters that match the Azure Cosmos DB for PostgreSQL reserved capacity reservation scope and attributes. You can update the scope of the Azure Cosmos DB for PostgreSQL reserved capacity reservation through the Azure portal, PowerShell, the Azure CLI, or the API.

To learn more about Azure reservations, see the following articles: