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MongoDB Atlas

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 S3 buckets from more than one AWS account

  • 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

  • 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.


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

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