You can create database links from an Autonomous Database to another Autonomous Database, to other Oracle databases, or to non-Oracle databases. In addition, you can create database links from other databases to an Autonomous Database.

• Create Database Links from Autonomous Database to Another Autonomous Database
  You can create database links from Autonomous Database to another Autonomous Database that is on a private endpoint or on a public endpoint (publicly accessible).
• Create Database Links to an Oracle Database that is not an Autonomous Database
  You can create database links from an Autonomous Database to an Oracle database that is on a private endpoint or on a public endpoint (publicly accessible).
• Create Database Links to Non-Oracle Databases
  You can create database links from Autonomous Database to Non-Oracle databases.
• Create Database Links from Other Databases to Autonomous Database
  You can create database links to an Autonomous Database from an Oracle database that is not an Autonomous Database. For example from an on-premise Oracle database to an Autonomous Database
• Drop Database Links
  After you create a database link you can drop the database link.