Autonomous Database uses predefined maintenance windows to automatically patch your database.
All Autonomous Database instances are automatically assigned to a maintenance window and different instances can have different maintenance windows. On the Autonomous Database details page, the Next Maintenance field shows the date and time for the upcoming maintenance window; this field is updated automatically when the next maintenance window is scheduled.
Note:Your database remains available during the maintenance window. Your existing database connections may get disconnected briefly; however, you can immediately reconnect and continue using your database.
Note:If your database is in the stopped state during the maintenance window, the database changes from the patch are applied when you start your database.
You can use Oracle Cloud Infrastructure Events to be notified when maintenance starts and ends on your Autonomous Database instance. See About Information Events on Autonomous Database for more information.