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The change-vector reflects the cluster-wide point in time where something happened. It includes the unique database ID, node identifier, and the Etag of the document in the specific node.
When a document is downloaded from the server, it contains various metadata information e.g. ID or current change-vector. Current change-vector is stored within the metadata in session and is available for each entity using the getChangeVectorFor() method from the advanced session operations.
Syntax
session.advanced.getChangeVectorFor(entity);
Parameters
instance
object
Instance of an entity for which an Etag will be returned.
Return Value
string
Returns the current change-vector for an entity. Throws an exception if the instance is not tracked by the session.