1.db.media.copyTo('test1')报错
解决办法：
在官网 http://docs.mongodb.org/manual/reference/command/eval/#dbcmd.eval 有一段描述：
If authorization is enabled, you must have access to all actions on all resources in order to run eval.
Providing such access is not recommended, but if your organization requires a user to run eval,
create a role that grants anyAction on anyResource. Do not assign this role to any other user.
2.解决步骤
新建一个角色
use admin
db.createRole({role:'sysadmin',roles:[],privileges:[{resource:{anyResource:true},actions:['anyAction']}]})
在现有的用admin上增加 sysadmin 角色
use admin
db.grantRolesToUser( "admin", [ { role: "sysadmin",db:"admin"} ] )
3.切换到目标数据库执行db.media.copyTo('test1')
