步骤如下:
SQL> exec dbms_audit_mgmt.init_cleanup(dbms_audit_mgmt.audit_trail_aud_std, 12);
PL/SQL procedure successfully completed.
SQL> begin
  2  if dbms_audit_mgmt.is_cleanup_initialized(dbms_audit_mgmt.audit_trail_aud_std) then
  3  dbms_output.put_line('initialized');
  4  else
  5  dbms_output.put_line('not initialized');
  6  end if;
  7  end;
  8  /
PL/SQL procedure successfully completed.
SQL> exec dbms_audit_mgmt.clean_audit_trail(dbms_audit_mgmt.audit_trail_aud_std, false);
PL/SQL procedure successfully completed.
SQL> select count(*) from unified_audit_trail;
  COUNT(*)
----------
         4