我需要从我的 MongoDB（托管在 MongoHQ // Compose.io）实例中导出一些信息。我正在遵循这些说明，其中提供了我需要的所有示例，并且似乎与官方 mongo 文档相对应。这是我正在运行的命令：
mongoexport -h kahana.mongohq.com:12345/my_db_name -u username -p password -d my_db -c usercollection -f "firstName,lastName,macIdNum,iclass" --csv
和输出：
2014-09-17T21:58:12.806-0500 starting new replica set monitor for replica set kahana.mongohq.com:10043 with seeds my_db_name:27017
2014-09-17T21:58:12.806-0500 [ReplicaSetMonitorWatcher] starting
2014-09-17T21:58:12.919-0500 getaddrinfo("my_db_name") failed: nodename nor servname provided, or not known
2014-09-17T21:58:12.952-0500 warning: No primary detected for set kahana.mongohq.com:12345
2014-09-17T21:58:12.952-0500 All nodes for set kahana.mongohq.com:12345 are down. This has happened for 1 checks in a row. Polling will stop after 29 more failed checks
couldn't connect to [kahana.mongohq.com:12345/my_db_name] connect failed to replica set kahana.mongohq.com:12345/my_db_name:27017
不太确定这里有什么问题。任何帮助将不胜感激！