Mongodb:基本示例的 mongorestore "assertion 13106"

Mongodb: mongorestore "assertion 13106" for basic example

我尝试 运行 backup/restore 'The Little MongoDB Book'

第 7 章的示例
mongodump --db learn --out backup

mongorestore --collection unicorns backup/learn/unicorns.bson

mongodump 执行得很好,但是当我尝试使用 mongorestore 时出现此错误:

$ mongorestore --collection unicorns backup/learn/unicorns.bson
connected to: 127.0.0.1
assertion: 13106 nextSafe(): { $err: "Invalid ns [.unicorns]", code: 16256 }

我该如何解决这个问题? Win7

$ mongod --version
db version v2.6.6
2015-01-26T23:29:09.224+1100 git version: 608e8bc319627693b04cc7da29ecc300a5f45a1f

$ mongorestore --version
 version 2.6.6

mongorestore 缺少数据库选项。尝试

.\mongorestore.exe  -db learn --collection unicorns backup/learn/unicorns.bson