https://docs.oracle.com/cd/F19136_01/dbseg/introduction-to-auditing.html#GUID-AE3A5133-D90F-4447-822C-CF186247EDDC
https://docs.oracle.com/cd/F19136_01/upgrd/recommended-and-best-practices-complete-upgrading-oracle-database.html#GUID-21FE7F97-DE79-43D4-A8DD-D66035C17608
SELECT VALUE FROM V$OPTION WHERE PARAMETER = 'Unified Auditing';
SHUTDOWN IMMEDIATE
cd $ORACLE_HOME/rdbms/lib
make -f ins_rdbms.mk uniaud_on ioracle
STARTUP
SELECT VALUE FROM V$OPTION WHERE PARAMETER = 'Unified Auditing';
select count(*) from UNIFIED_AUDIT_TRAIL;