A. Navigate to the Audit console and search the previous 24 hours for all Delete actions to get a list of any resource that was deleted in the past 24 hours.

B. Create a serial console connection to the DB System that does not appear in the management console.
Connect to the serial console connection, and then review the system logs under /var/log/messages.

C. View the service limits associated with your account to ensure that you have not exceeded the available number of DB system in your tenancy.

D. Navigate to the Audit console and search the previous 24 hours for all List actions to get a list of every event that occurred in the past 24 hours.