cloneCollection¶

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Definition
Behavior
Example

Definition¶

cloneCollection¶

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.

Behavior¶

mongos does not support cloneCollection.

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

在 3.0 版更改: If the given namespace already exists in the destination mongod instance, cloneCollection will return an error.

Example¶

db.runCommand( { cloneCollection: "users.profiles",
                 from: "mongodb.example.net:27017",
                 query: { 'active' : true }
               } )

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

← clone cloneCollectionAsCapped →