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renameCollection

Definition

renameCollection

Changes the name of an existing collection. Specify collection names to renameCollection in the form of a complete namespace (<database>.<collection>).

Issue the renameCollection command against the admin database.

The command takes the following form:

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{ renameCollection: "<source_namespace>", to: "<target_namespace>", dropTarget: <true|false>  writeConcern: <document> }

The command contains the following fields:

Field	Type	Description
renameCollection	string	The namespace of the collection to rename. The namespace is a combination of the database name and the name of the collection.
to	string	The new namespace of the collection. If the new namespace specifies a different database, the renameCollection command copies the collection to the new database and drops the source collection. See Naming Restrictions.
dropTarget	boolean	Optional. If true, mongod will drop the target of renameCollection prior to renaming the collection. The default value is false.
writeConcern	document	Optional. A document that expresses the write concern for the operation. Omit to use the default write concern.

Behavior

Sharded Collections

renameCollection is not compatible with sharded collections.

Existing Target Collection

renameCollection fails if target is the name of an existing collection and you do not specify dropTarget: true.

Performance

Changed in version 3.6.

renameCollection has different performance implications depending on the target namespace.

If the target database is the same as the source database, renameCollection simply changes the namespace. This is a quick operation.

If the target database differs from the source database, renameCollection copies all documents from the source collection to the target collection. Depending on the size of the collection, this may take longer to complete. Other operations which require exclusive access to the affected databases will be blocked until the rename completes. See What locks are taken by some common client operations? for operations which require exclusive access to all databases.

local Database

• You cannot rename a collection from a replicated database to the local database, which is not replicated.
• You cannot rename a collection from the local database, which is not replicated, to a replicated database.

Example

The following example renames a collection named orders in the test database to orders2014 in the test database.

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db.adminCommand( { renameCollection: "test.orders", to: "test.orders2014" } )

The mongo shell provides the db.collection.renameCollection() helper for the command to rename collections within the same database. The following is equivalent to the previous example:

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use test
db.orders.renameCollection( "orders2014" )

Exceptions

exception 10026:  Raised if the source namespace does not exist. exception 10027:  Raised if the target namespace exists and dropTarget is either false or unspecified. exception 15967:  Raised if the target namespace is an invalid collection name.

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