Key Column Path

The collection metadata component that specifies the top-level document path to the field used as an embedded document key.

The component value is top-level path _id, the embedded key for documents in a collection used by Oracle Database API for MongoDB.

This metadata component is required for key-column assignment method EMBEDDED_OID, and it is used only with that assignment method. It is provided automatically when EMBEDDED_OID is used; you need not specify it explicitly.

(If you do specify this component then an error is raised if keyColumn.path is specified for an assignment method other than EMBEDDED_OID, or if the value specified is not _id.)

Property	Value
Default value	_id
Allowed values	_id
JSON collection metadata document path	keyColumn.path