Ultipa Graph system provides two types of unique identifiers: UUID and ID. UUID is of int64 type with the property name _uuid, it yields the highest efficiency when querying. ID is stored as a string with the maximum length of 128 bytes, and the property name is _id, ID is supported by node only and can be used to represent some actual meaning of the node, such as card number, employee number, etc.

The UUID and ID of nodes in a GraphSet keep a one-to-one mapping relationship.

In normal cases, the order of query efficiency in Ultipa Graph system is: UUID > ID > Index/LTE