Today, we’re announcing the general availability of Amazon DocumentDB Serverless, a new configuration for Amazon DocumentDB (with MongoDB compatibility) that automatically scales compute and memory based on your application’s demand. Amazon DocumentDB Serverless simplifies database management with no upfront commitments or additional costs, offering up to 90 percent cost savings compared to provisioning for peak capacity.

With Amazon DocumentDB Serverless, you can use the same MongoDB compatible-APIs and capabilities as Amazon DocumentDB, including read replicas, Performance Insights, I/O optimized, and integrations with other Amazon Web Services (AWS) services.

Amazon DocumentDB Serverless introduces a new database configuration measured in a DocumentDB Capacity Unit (DCU), a combination of approximately 2 gibibytes (GiB) of memory, corresponding CPU, and networking. It continually tracks utilization of resources such as CPU, memory, and network coming from database operations performed by your application.

Amazon DocumentDB Serverless automatically scales DCUs up or down to meet demand without disrupting database availability. Switching from provisioned instances to serverless in an existing cluster is as straightforward as adding or changing the instance type. This transition doesn’t require any data migration. To learn more, visit How Amazon DocumentDB Serverless works.

Some key use cases and advantages of Amazon DocumentDB Serverless include:

• Variable workloads – With Amazon DocumentDB Serverless, you can handle sudden traffic spikes such as periodic promotional events, development and testing environments, and new applications where usage might ramp up quickly. You can also build agentic AI applications that benefit from built-in vector search for Amazon DocumentDB and serverless adaptability to handle dynamically invoked agentic AI workflows.
• Multi-tenant workloads – You can use Amazon DocumentDB Serverless to manage individual database capacity across the entire database fleet. You don’t need to manage hundreds or thousands of databases for enterprises applications or multi-tenant environments of a software as a service (SaaS) vendor.
• Mixed-use workloads – You can balance read and write capacity in workloads that periodically experience spikes in query traffic, such as online transaction processing (OLTP) applications. By specifying promotion tiers for Amazon DocumentDB Serverless instances in a cluster, you can configure your cluster so that the reader instances can scale independently of the writer instance to handle the additional load.

For steady workloads, Amazon DocumentDB provisioned instances are more suitable. You can select an instance class that offers a predefined amount of memory, CPU power, and I/O bandwidth. If your workload changes when using provisioned instances, you should manually modify the instance class of your writer and readers. Optionally, you can add serverless instances to an existing provisioned Amazon DocumentDB cluster at any time.

Amazon DocumentDB Serverless in action
To get started with Amazon DocumentDB Serverless, go to the Amazon DocumentDB console. In the left navigation pane, choose Clusters and Create.

On the Create Amazon DocumentDB cluster page, choose Instance-based cluster type and then Serverless instance configuration. You can choose minimum and maximum capacity DCUs. Amazon DocumentDB Serverless is supported starting with Amazon DocumentDB 5.0.0 and higher with a capacity range of 0.5–256 DCUs.

If you use features such as auditing and Performance Insights, consider adding DCUs for each feature. To learn more, visit Amazon DocumentDB Serverless scaling configuration.

To add a serverless instance to an existing provisioned cluster, choose Add instances on the Actions menu when you choose the provisioned cluster. If you use a cluster with an earlier version such as 3.6 or 4.0, you should first upgrade the cluster to the supported engine version (5.0).

On the Add instances page, choose Serverless in the DB instance class section for each new serverless instance you want to create. To add another instance, choose Add instance and continue adding instances until you have reached the desired number of new instances. Choose Create.

You can perform a failover operation to make a DocumentDB Serverless instance the cluster writer. Also, you can convert any remaining provisioned Amazon DocumentDB instances to DocumentDB Serverless instances by changing an instance’s class or removing them from the cluster by deleting an Amazon DocumentDB instance.

Now, you can connect to your Amazon DocumentDB cluster using AWS CloudShell. Choose Connect to cluster, and you can see the AWS CloudShell Run command screen. Enter a unique name in New environment name and choose Create and run.

When prompted, enter the password for the Amazon DocumentDB cluster. You’re successfully connected to your Amazon DocumentDB cluster, and you can run a few queries to get familiar with using a document database.

To learn more, visit Creating a cluster that uses Amazon DocumentDB Serverless and Managing Amazon DocumentDB Serverless in the AWS documentation.

Now available
Amazon DocumentDB Serverless is now available starting with Amazon DocumentDB 5.0 for both new and existing clusters. You only pay a flat rate per second of DCU usage. To learn more about pricing details and Regional availability, visit the Amazon DocumentDB pricing page.

Give these new features a try in the Amazon DocumentDB console and send feedback to AWS re:Post for Amazon DocumentDB or through your usual AWS Support contacts.

— Channy

7/31/2025: Updated screenshot