arangodb/Documentation/Examples/shell_collection-truncate-db

arango> col = db.examples;
[ArangoCollection 91022, "examples" (status new born)]
arango> col.save({ "Hello" : "World" });
{ "_id" : "91022/1532814", "_rev" : "1532814" }
arango> col.count();
1
arango> db._truncate(col);
arango> col.count();
0