Deployment Models & Regions

Global Deployment

A globally deployed App is hosted across the world in all of the following AWS regions:

• Ireland (IE) - aws-eu-west-1

• Oregon (US-OR) - aws-us-west-2

• Sydney (AU) - aws-ap-southeast-2

• Virginia (US-VA) - aws-us-east-1

An App can handle most types of requests from any region. For example, any region can run serverless functions, evaluate rules, validate object schemas, or authenticate users.

All write operations to a linked MongoDB data source are handled within a single region that you specify when you create the App. You can choose any global region to handle writes, but should generally choose the region closest to your MongoDB cluster. If a server in another region needs to handle a write request, it forwards the request to the configured write region, which adds latency to the write operation.

Realm SDKs automatically execute application requests, such as reading user information or calling a function, in the global deployment region that's closest to the user that issued the request. Requests sent to a global URL (e.g. with the Data API or GraphQL) are forwarded to the closest server at the DNS level. Requests sent to a region-specific URL execute in that region regardless of the user's location.

Local Deployment

A locally deployed App is available in a single cloud provider region. All requests and MongoDB write operations are handled exclusively in the region, which you specify when you create the App.

You can deploy to any region, but should generally choose the region closest to your application's users.