Configure Access Control Lists for an Existing Autonomous Database Instance
You can control and restrict access to your Autonomous Database by specifying network access control lists (ACLs). On an existing Autonomous Database instance with a public endpoint you can add, change, or remove ACLs.
Configure ACLs, or add, remove, or update existing ACLs for an Autonomous Database instance as follows:
If the Lifecycle State is Available when you click Update the Lifecycle State changes to Updating until the ACL is set. The database is still up and accessible, there is no downtime. When the update is complete the Lifecycle State returns to Available and the network ACLs from the access control list are in effect.