What is Oracle 12c Unified Auditing? The short answer is the view UNIFED_AUDIT_TRAIL. This view consolidates all logging and auditing information into a single source. Regardless of using either Mixed Mode or Pure Unified Auditing, the SYS.UNIFIED_AUDIT_TRAIL can be used.
The key column in SYS.UNIFIED_AUDIT_TRAIL is AUDIT_TYPE. This column shows from which Oracle component the log data originated -