Azure Cosmos DB pricing

Globally distributed, multi-model database service

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Azure Cosmos DB is Microsoft’s globally distributed multi-model database. Azure Cosmos DB was built from the ground up with global distribution and horizontal scale at its core. It offers turnkey global distribution across any number of Azure regions by transparently scaling and replicating your data wherever your users are. Elastically scale throughput and storage worldwide and pay only for the throughput and storage you need. Azure Cosmos DB guarantees single-digit-millisecond latencies at the 99th percentile anywhere in the world, offers multiple well-defined consistency models to fine-tune performance and guarantees high availability with multi-homing capabilities—all backed by industry leading service level agreements (SLAs).

Azure Cosmos DB is truly schema-agnostic—it automatically indexes all the data without requiring you to deal with schema and index management. It is also multi-model, natively supporting document, key-value, graph and column-family data models. With Azure Cosmos DB, you can access your data using APIs of your choice, as DocumentDB SQL (document), MongoDB (document), Azure Table Storage (key-value) and Gremlin (graph) are all natively supported.

Pricing details

Provisioned throughput

At any scale, you can store data and provision throughput capacity. Each container is billed hourly based on the amount of data stored (in GBs) and throughput reserved in units of 100 RUs/second, with a minimum of 400 RUs/second. Unlimited containers have a minimum of 100 RUs/second per partition.

During public preview, there is no additional charge for using the Gremlin API.

Unit Price
SSD Storage (per GB) $- GB/mo
Reserved RUs/second (per 100 RUs, 400 RUs minimum) $-
Standard data transfer rates apply. Monthly price estimates are based on 744 hours per month.

Add-on Provisioning—Request Units per Minute (preview)

You can now complement your Provisioned Throughput with an opt-in Provisioned Request Units per Minute feature. Provisioned Request Units per Minute lets you consume a bucket of requests on a per-minute basis (UTC). Request Units per Minute are capped at 1,000 Request Units per Minute for every 100 provisioned throughput units per second. The price below reflects a 50% preview discount.

Unit Price
Reserved RUs/minute (per 1,000 RUs) $-

Scaling containers

For high-throughput and high-storage workloads you can create unlimited storage containers by defining a partition key at container creation. A partitioned container will seamlessly scale out as the quantity of stored data grows and reserved throughput increases.

Azure Cosmos DB Emulator (free)

Download the free Azure Cosmos DB Emulator to develop and test applications using Azure Cosmos DB from your local machine. Once you are satisfied with how your application works, you can deploy it by just changing your configuration to point to an Azure Cosmos DB instance.

Planet scale with geo-replication

Azure Cosmos DB containers can be globally distributed to help you easily build apps with planet scale which means all your data is automatically replicated to the regions you specify. Your app continues to work with one logical endpoint, while your data is automatically served from the region closest to your users with an intuitive programming model for data consistency and 99.99 availability. Globally distributed containers are billed based on the storage consumed in each region and throughput reserved for each Azure Cosmos DB container x the number of regions associated with a Azure Cosmos DB database account. Standard data transfer rates apply for replication data transfer between regions. As an example, say you have a database account spanning three Azure regions and two containers provisioned with 1M RUs and 2M RUs respectively. The total RUs provisioned for the first container will be 3M RUs (1M RUs x 3 regions) and the second one will be 6M RUs (2M RUs x 3 regions).

High throughput and low latency queries

With Azure Cosmos DB, while you write a sustained volume of data, these data will be synchronously indexed to serve consistent SQL queries using a write-optimized, latch-free database engine designed for solid-state drives (SSDs) and low latency access. Read and write requests are always served from your local region while data is distributed globally. You can further optimise performance by customising automatic index behaviour.

Support & SLA

  • We provide technical support for all Azure services released to General Availability, including Azure Cosmos DB, through Azure Support, starting at $29.0/month. Billing and subscription management support is provided for free.
  • SLA—We guarantee at least 99.99% of the time we will successfully process requests to perform operations against Azure Cosmos DB Resources. To learn more about our SLA, please visit the SLA page.

FAQ

  • A Request Unit (RU) is the measure of throughput in Azure Cosmos DB. 1 RU corresponds to the throughput of the GET of a 1 KB item. Every operation in Azure Cosmos DB, including reads, writes, SQL queries and stored procedure executions has a deterministic Request Unit value based on the throughput required to complete the operation. Instead of thinking about CPU, IO, and memory and how they each impact your application throughput, you can think in terms of a single Request Unit measure.

    A Request Unit consumed through Provisioned RUs per second or a one-minute bucket is the same.

    For more information about Request Units and for help determining your container needs, please go here.

  • You are billed with a flat, predictable hourly rate based on the overall capacity (RU/sec) that has been provisioned under your Azure Cosmos DB account during that period.

    If you create an account in East US 2 using two single partitions with 500 RU/sec and 700 RU/sec, respectively, you would have a total provisioned capacity of 1,200 RU/sec. You would thus be charged 12 x $- = $-/hr.

    If your throughput needs changed and you increased each partition’s capacity by 500 RU/sec while also creating a new unlimited storage container using 20,000 RU/sec, your overall provisioned capacity would be 22,200 RU/sec (1,000 RU/sec + 1,200 RU/sec + 20,000RU/sec). Your bill would then change to: $- x 222 = $-/hr.

    In a month of 720 hours, if 500 hours are provisioned at 1,200 RU/sec and 220 hours are provisioned at 22,200 RU/sec, your monthly bill will show—500 x $-/hr + 220 x $-/hr = $-/hr

  • You can now provision add-on Request Units per Minute in addition to regular provisioned throughput. You can consume these add-on throughput units in a UTC minute window. For every 100 RUs/second provisioned in your container, if Request Units per Minute is enabled, you will be able to consume an additional 1,000 Request Units per Minute.

    For example, if you provision 400 RUs/second, it will allow you to consume an add-on of 4,000 Request Units per Minute. Let us say at 12:00:00 PM, your application needs more than 400 RUs/second. Starting from 12:00:01 PM to 12:01:00 PM, your application will be able to consume 4,000 additional requests units, while continuing to consume your provisioned throughput of 400 RU/s. Starting at 12:00:01 PM, if you consume all the 4,000 request units before 12:01:00 PM, you cannot consume anymore additional request units until the next UTC minute (starting at 12:01:01 PM). If you do not consume all the 4,000 in a given minute window, the left-over request units do not roll over to the next minute window.

    For more information, see our documentation page about Request Units per Minute.

  • Storage capacity is billed in units of the maximum hourly amount of data stored, in GB, over a monthly period. For example, if you utilised 100 GB of storage for half of the month and 50 GB for the second half of the month, you would be billed for an equivalent of 75 GB of storage during that month.

  • You are billed the flat rate for each hour the container exists, regardless of usage or if the container is active for less than an hour. For example, if you create a container and delete it 5 minutes later, your bill will reflect a charge for 1 unit hour.

  • If you define your own performance for a container and you upgrade at 9:30 AM from 400 RUs to 1,000 RUs and downgrade at 10:45 AM back to 400 RUs, you will be charged for two hours of 1,000 RUs.

    If you select a pre-defined collection performance level, and you upgrade at 9:30 AM from an S1 collection to an S3 collection, and downgrade at 10:45 AM back to S1, you will be charged for two hours of S3.

  • You can scale up or scale down the number of Request Units for each container within your Azure Cosmos DB account by using the Azure Portal, one of the supported SDKs, or the REST API.

  • To move a collection of S1, S2 or S3 performance tier to a single partition with the same storage size, see Changing performance levels using the Azure Portal.

    To move an existing single collection to an unlimited storage container, see Partitioning and Scaling in Azure Cosmos DB.

  • At an entry point, single partition has more throughput than S1 (400 RU/sec versus 250 RU/sec) at a lower price. You can also scale up to 10,000 RU/sec versus 2,500 RU/sec with S3. The great thing with the new provisioning model is that you can scale by increment of 100 RU/sec, so you do not need to pay for S3 at 2,500 RU/sec when you only need 1,200 RU/sec.

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