arangosh> col = db.example;
[ArangoCollection 26093731, "example" (type document, status loaded)]
arangosh> col.save({ "Hello" : "World" });
{ 
  "error" : false, 
  "_id" : "example/26421411", 
  "_rev" : "26421411", 
  "_key" : "26421411" 
}
arangosh> col.count();
1
arangosh> db._truncate(col);
arangosh> col.count();
0