1. 利用foreach方法在shell里直接运行
>mongo
>use xxx
>db.test(复制源表).find().forEach(function(x){
db.target(目的表).insert(x);
})
2. 使用copyTo()命令
db.原始表.copyTo(新的表)
例如:
>use YYDB
>db.XX_OLD.copyTo('XX_NEW')
你的mongo有帐号密码,就会报错:
2021-05-27T11:35:27.762+0800 E QUERY [thread1] Error: {
"ok" : 0,
"errmsg" : "not authorized on XXX to execute command { $eval: function (collName, newName) {\n var from = db[collName];\n ..., args: [ \"XXX\", \"XXX\" ] }",
"code" : 13,
"codeName" : "Unauthorized"
} :
原因: eval方法执行需要认证
解决办法:
1> 创建角色
> use admin
switched to db admin
> db.createRole(
{
"role": "evalRole",
"db": "admin",
"privileges": [
{"resource": {"anyResource": true }, "actions": ["anyAction"] }
],
"roles": [
{"role": "root", "db": "admin"}
]
}
)
2>将角色授权给需要操作的用户
> use LOG
switched to db LOG
> db.grantRolesToUser("dbuser", [ { role: "evalRole", db: "admin" } ])
追究用户dbuser的角色
3> 可以执行拷贝了
>use LOG
>db.auth('dbuser','密码')
>db.XXX.copyTo('YYY')