Define Data Stores for a Federated Database Instance

Data Federation Access

When you create a federated database instance, you grant Atlas either read only or read and write access to S3 buckets in your AWS account. To access your Atlas clusters, Atlas uses your existing Role Based Access Controls. You can view and edit the data storage configuration that maps data from your S3 buckets and Atlas clusters to federated database instances and virtual collections.

Privilege Actions

Privilege actions define the operations that you can perform on your federated database instance. You can grant the following Atlas Data Federation privileges:

• When you create or modify custom roles from the Atlas User Interface

• In the actions.action request body parameter when you create or update a custom role from the Atlas API

sqlGetSchema

Retrieve the schema stored for a collection or view using the sqlGetSchema command.

sqlSetSchema

Set or delete the schema for a collection or view using the sqlSetSchema command.

viewAllHistory

Retrieve details about the queries that were run in the past using $queryHistory.

outToS3

Write data from any one of the supported federated database instance stores or multiple supported federated database instance stores to your S3 bucket using $out.

storageGetConfig

Retrieve your federated database instance storage configuration using the storageGetConfig command.

storageSetConfig

Set or update your federated database instance storage configuration using the storageSetConfig command.

Set or Update Federated Database Instance Configuration

Once connected to the federated database instance, you can use the following database commands to set or update the federated database instance configuration:

use admin
db.runCommand( { "storageSetConfig" : <config> } )

Replace <config> with the configuration for the federated database instance. You can validate your configuration before setting or updating the federated database instance configuration by running the storageValidateConfig command.

To set or update the storage configuration through the Atlas UI:

You can also set and manage the storage configuration using the Manage a Federated Database Instance.

Validate Federated Database Instance Configuration

You can run the following command to validate your federated database instance configuration.

use admin
db.runCommand( { "storageValidateConfig" : <config> } )

Replace <config> with the configuration for the federated database instance.

The command returns the following if your federated database instance configuration is valid:

{ "ok" : 1 }

The command returns the list of errors in the errs field if your federated database instance storage configuration is invalid:

{
       "ok" : 1,
       "errs" : [
               "<error>",
               "<error>",
               ...
       ]
}

Generate Federated Database Instance Configuration

You can run the storageGenerateConfig command to regenerate a federated database instance configuration. The command returns an automatically generated configuration, which you can then modify and upload. In the automatically generated configuration, Federated Database Instance regenerates a database for each store:

• The databases.[n].name will be the same as the stores.[n].name that it maps to.

• Each database will contain up to 3 collections and a wildcard (*) collection.

As a result, the databases array in the generated configuration might be different from the databases array in your existing configuration.

To generate a configuration for a federated database instance, connect to the federated database instance and run the following database commands:

use admin
db.runCommand( { "storageGenerateConfig" : 1 } )

Retrieve Federated Database Instance Configuration

Once connected to the federated database instance, you can use the following database commands to retrieve the federated database instance configuration:

use admin
db.runCommand( { "storageGetConfig" : 1 } )

The command returns the current federated database instance configuration.

Generate Wildcard Collections

You can dynamically generate collection names that map to data in your S3 bucket or Atlas cluster. To dynamically generate collection names, specify the wildcard, *, as the value for the collection name setting in your federated database instance storage configuration. You can't dynamically generate collection names in your federated database instance storage configuration that map to data in your HTTP or HTTPS data store.

You can use the storageSetConfig command to configure the settings for generating wildcard (*) collections.

To learn more about the configuration settings for generating wildcard collections, see:

• Generate wildcard collections for data in AWS S3 buckets

• Generate wildcard collections for data in Atlas cluster