arangosh> col = db.example;
[ArangoCollection 1123611531, "example" (type document, status loaded)]
arangosh> col.save({ "Hello" : "World" });
{ 
  "_id" : "example/1123939211", 
  "_rev" : "1123939211", 
  "_key" : "1123939211" 
}
arangosh> col.count();
1
arangosh> db._truncate("example");
arangosh> col.count();
0