arangosh> a1 = db.example.insert({ a : 1 }); { "_id" : "example/74092", "_key" : "74092", "_rev" : "_ZXF6dMm---" } arangosh> a2 = db.example.replace(a1, { a : 2 }); { "_id" : "example/74092", "_key" : "74092", "_rev" : "_ZXF6dMm--B", "_oldRev" : "_ZXF6dMm---" } arangosh> db.example.remove(a1); [ArangoError 1200: precondition failed] arangosh> db.example.remove(a1, true); { "_id" : "example/74092", "_key" : "74092", "_rev" : "_ZXF6dMm--B" } arangosh> db.example.document(a1); [ArangoError 1202: document not found]