Mongodb manage commands gist

mongodb.gist

# Mongodb get collection key names

mr = db.runCommand({
  "mapreduce" : "input_collection_name_here",
  "map" : function() {
    for (var key in this) { emit(key, null); }
  },
  "reduce" : function(key, stuff) { return null; }, 
  "out": "input_collection_name_here" + "_keys"
});
db[mr.result].distinct("_id");