Index for all vertices in Neo4j

Question

I need to create a unique index across any vertex, irrespective of label, in Neo4j.

I can do the following, but it would not guarantee global uniqueness:

CREATE CONSTRAINT ON (x:myType1) ASSERT x.identifier IS UNIQUE

The above would allow (x:myType1) and (y:myType2) to have the same identifier.

Is there any way I could implement a globally unique uniqueness constraint?

Answer 1

There might be better ways, but I just seem to have found one: using another label.

CREATE (v:label1:global {identifier:"12345")

And have the global uniqueness constraint only set against the global label:

CREATE CONSTRAINT ON (g:global) ASSERT g.identifier IS UNIQUE