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Data Federation Limitations

Data Federation does not support the following features:

  • Creating Indexes

  • Authenticating with methods other than SCRAM, X.509 Certificates, OIDC, and AWS IAM

  • Monitoring federated database instances with Atlas monitoring tools

  • Creating a federated database instance with cloud storage from more than one cloud service provider.

  • Creating a federated database instance with cloud storage from more than one account on the same cloud service provider.

  • Querying documents larger than 16MB

  • Returning documents in the same order across queries unless imposed by the query operators used

  • Having more than 60 guaranteed simultaneous connections per region to a federated database instance. In some scenarios, you may have more than 60 simultaneous connections per region to a federated database instance, but MongoDB can't guarantee to support this for any particular scenario.

  • Running more than 30 simultaneous queries on your federated database instance

    If your aggregation pipeline only contains the $currentOp stage, Atlas Data Federation doesn't enforce the limit on the maximum number of simultaneous queries. You can run queries that only contain the $currentOp stage even after you reach the maximum number of simultaneous queries.

    Important

    Atlas Data Federation automatically expires your cursor if you do not consume at least 16MiB of results every 1 minute.

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