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Copies a collection from a remote mongod instance to the current mongod instance. cloneCollection creates a collection in a database with the same name as the remote collection’s database. cloneCollection takes the following form:

{ cloneCollection: "<namespace>",
  from: "<hostname>",
  query: { <query> }

cloneCollection has the following fields:

Field Type Description
cloneCollection string The namespace of the collection to copy. The namespace is a combination of the database name and the name of the collection.
from string The address of the server to clone from.
query document Optional. A query that filters the documents in the source collection that cloneCollection will copy to the current database.


mongos does not support cloneCollection.

cloneCollection cannot be used if the from server has authorization enabled.

Changed in version 3.0: If the given namespace already exists in the destination mongod instance, cloneCollection will return an error.


db.runCommand( { cloneCollection: "users.profiles",
                 from: "",
                 query: { 'active' : true }
               } )

This operation copies the profiles collection from the users database on the server at The operation only copies documents that satisfy the query { 'active' : true }.