graph - Gremlin remove all Vertex

Question

I know how to remove a vertex by id, but I need to delete multiple vertices (clean the db).

Deleting 1 v is like this:

ver = g.v(1)
g.removeVertex(ver)

Answer 1

In more recent terms as of Gremlin 2.3.0, removal of all vertices would be best accomplished with:

g.V.remove()

UPDATE: For version Gremlin 3.x you would use drop():

gremlin> graph = TinkerFactory.createModern()
==>tinkergraph[vertices:6 edges:6]
gremlin> g = graph.traversal()
==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
gremlin> g.V().drop().iterate()
gremlin> graph
==>tinkergraph[vertices:0 edges:0]

Note that drop() does not automatically iterate the Traversal as remove() did so you have to explicitly call iterate() for the deletion to occur. Iteration in the Gremlin Console is discussed in detail in this tutorial.

Also, consider that different graph systems will potentially have their own methods for more quickly and efficiently removing all data in that system. For example, JanusGraph has this approach:

 JanusGraphFactory.drop(graph)

where "graph" is a JanusGraph instance you want cleared out.