Audit events
Any database server activity that can potentially alter or reveal data or the auditing configuration is considered an event. You can use the database server secure-auditing facility to audit and keep a record of events either when they succeed or fail, or when the activity is attempted. You can identify each audit event by a four-letter event code. Audit event codes and fields lists the audit-event codes and describes the events that you can audit with the secure-auditing facility.
You can specify events that you want to audit in an audit mask. Auditing is based on the notion of audit events and audit masks.