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Query and Write Operation Commands

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  • aggregate
  • count
  • find

Note

Atlas Data Federation doesn't include a server-side JavaScript engine. So, it doesn't support commands like mapReduce that require server-side scripting enabled.

aggregate

For the aggregate command, the following limitation applies:

  • Atlas Data Federation supports the explain, cursor, comment, and background options only.

  • For the comment option, Atlas Data Federation supports only type string.

  • Atlas Data Federation supports {"background" : <boolean>} option for $out to S3 and Atlas cluster only. The background option is not available for other aggregation pipeline stages. See $out Options for more information.

Tip

See also:

Supported Aggregation Pipeline Stages and Operators.

count

For the count command, the following limitations apply:

  • Atlas Data Federation converts count() to an aggregation pipeline internal to Data Federation.

  • Atlas Data Federation supports only the query option.

find

For find command, Atlas Data Federation supports the following options:

  • batchSize

  • singleBatch

  • filter

  • limit

  • projection

  • skip

  • sort

find() is converted to an aggregation pipeline internal to the federated database instance.

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