db.cloneCollection()¶

说明¶

db.cloneCollection(from, collection, query)¶

直接在Mongodb实例间复制数据。 db.cloneCollection() 方法封装了 cloneCollection 命令，并接收如下参数：

Parameter	Type	Description
`from`	string	Host name of the MongoDB instance that holds the collection to copy.
`collection`	string	The collection in the MongoDB instance that you want to copy. `db.cloneCollection()` will only copy the collection with this name from database of the same name as the current database the remote MongoDB instance. If you want to copy a collection from a different database name you must use the `cloneCollection` directly.
`query`	document	Optional. A standard query document that limits the documents copied as part of the `db.cloneCollection()` operation. All query selectors available to the `find()` are available here.

db.cloneCollection() 不允许通过 mongos 复制数据。必须直接连接 mongod 实例。

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