arangosh> col = db.example;
[ArangoCollection 1122628491, "example" (type document, status loaded)]
arangosh> col.save({ "Hello" : "World" });
{ 
  "_id" : "example/1122956171", 
  "_rev" : "1122956171", 
  "_key" : "1122956171" 
}
arangosh> col.count();
1
arangosh> db._truncate(col);
arangosh> col.count();
0