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db.collection.dataSize() (mongosh method)

Important

mongosh Method

This page documents a mongosh method. This is not the documentation for database commands or language-specific drivers, such as Node.js.

For the database command, see the size field returned by the collStats command.

For MongoDB API drivers, refer to the language-specific MongoDB driver documentation.

Definition

db.collection.dataSize()
Returns:The size in bytes of the collection.

Data compression does not affect this value.

To run on a replica set member, collStats operations require the member to be in PRIMARY or SECONDARY state. If the member is in another state, such as STARTUP2, the operation errors.

Compatibility

This method is available in deployments hosted in the following environments:

  • MongoDB Atlas: The fully managed service for MongoDB deployments in the cloud

Note

This command is supported in all MongoDB Atlas clusters. For information on Atlas support for all commands, see Unsupported Commands.

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