arangosh> db._query("FOR i IN 1..100 INSERT { _key: CONCAT('anothertest', TO_STRING(i)) } INTO mycollection").getExtra();
{ 
  "stats" : { 
    "writesExecuted" : 100, 
    "writesIgnored" : 0, 
    "scannedFull" : 0, 
    "scannedIndex" : 0, 
    "filtered" : 0 
  }, 
  "warnings" : [ ] 
}