怎样将 MongoDB 数据库里的 collection 复制到另一个 MongoDB 数据库里

Question

如题。由于数据结构变更，进行数据迁移，怎样将一个数据库里的某个 collection 复制到另一个数据库里。

Answer 1

db.copyDatabase(fromdb, todb, fromhost, username, password)

http://docs.mongodb.org/manual/reference/method/db.copyDatabase/

Answer 2

In the mongodb package you downloaded, there are mongoexport and mongoimport. These two programs are available, one is for backup and the other is for import. Or mongodump and mongorestore can also be used.