mongoshdeprecederror: [COMMON-10003] copyDatabase()已被移除，因为它在MongoDB 4.0中已弃用

我试过了。

db.copyDatabase('DB_toBeRenamed','Db_newName','host') 

然后才知道它已经被mongo社区弃用了，尽管它创建了备份或重命名了DB。

WARNING: db.copyDatabase is deprecated. See http://dochub.mongodb.org/core/copydb-clone-deprecation
{
        "note" : "Support for the copydb command has been deprecated. See 
        http://dochub.mongodb.org/core/copydb-clone-deprecation",
        "ok" : 1
}

所以不相信上面的方法，我不得不采取转储本地使用下面的命令

mongodump --host --db DB_TobeRenamed --out E://FileName/

连接到Db。

use DB_TobeRenamed

然后

db.dropDatabase()

然后使用命令恢复数据库。

mongorestore -host hostName -d Db_NewName E://FileName/

不，没有。见https://jira.mongodb.org/browse/server - 701

Unfortunately, this is not an simple feature for us to implement due to the way that database metadata is stored in the original (default) storage engine. In MMAPv1 files, the namespace (e.g.: dbName.collection) that describes every single collection and index includes the database name, so to rename a set of database files, every single namespace string would have to be rewritten. This impacts: the .ns file every single numbered file for the collection the namespace for every index internal unique names of each collection and index contents of system.namespaces and system.indexes (or their equivalents in the future) other locations I may be missing This is just to accomplish a rename of a single database in a standalone mongod instance. For replica sets the above would need to be done on every replica node, plus on each node every single oplog entry that refers this database would have to be somehow invalidated or rewritten, and then if it's a sharded cluster, one also needs to add these changes to every shard if the DB is sharded, plus the config servers have all the shard metadata in terms of namespaces with their full names. There would be absolutely no way to do this on a live system. To do it offline, it would require re-writing every single database file to accommodate the new name, and at that point it would be as slow as the current "copydb" command...

mongoshdeprecederror: [COMMON-10003] copyDatabase()已被移除，因为它在MongoDB 4.0中已弃用

替代解决方案:您可以转储您的数据库，并恢复到不同的名称。根据我的经验，它比db.copyDatabase()快得多。

$ mongodump -d old_db_name -o mongodump/
$ mongorestore -d new_db_name mongodump/old_db_name

http://docs.mongodb.org/manual/tutorial/backup-with-mongodump/

这是目前官方推荐的数据库重命名方法，因为copyDatabase在MongoDB 4.2中被删除了:

"copydb"命令已弃用，请使用以下两个命令: mongodb(用于备份数据) Mongorestore(将数据从mongodb恢复到一个新的命名空间)

在将所有数据放入管理数据库的情况下(您不应该这样做)，您将注意到db.copyDatabase()将不起作用，因为您的用户需要许多特权，而您可能不想给予它。下面是一个手动复制数据库的脚本:

use old_db
db.getCollectionNames().forEach(function(collName) {
    db[collName].find().forEach(function(d){
        db.getSiblingDB('new_db')[collName].insert(d); 
    }) 
});