You can easily migrate data from a user-created MongoDB instance to an ApsaraDB for MongoDB instance. Before using ApsaraDB for MongoDB, you need to pay attention to its constraints, as listed in the following table.
|Restart an instance||You must log on to the ApsaraDB for MongoDB console or call the RestartDBInstance operation to restart an instance.|
|Create a replica set||
|Select the database version and storage engine||For more information, see Versions and storage engines.|