SQL> show parameter ENABLE_DDL_LOGGING


NAME     TYPE VALUE
------------------------------------ ----------- ------------------------------
enable_ddl_logging     boolean FALSE
SQL> alter system set ENABLE_DDL_LOGGING=true;

SQL> create table look2 as select * from look;
Table created.
SQL> drop table look2;
Table dropped.
SQL> 


 <txt>create table look2 as select * from look
 </txt>
</msg>
[oracle@cloud12c ddl]$ cat log.xml 
<msg time='2017-11-21T13:33:37.964+08:00' org_id='oracle' comp_id='rdbms'
 msg_id='opiexe:4695:2946163730' type='UNKNOWN' group='diag_adl'
 level='16' host_id='cloud12c' host_addr='10.60.17.99'
 pid='7510' version='1'>
 <txt>alter table look modify (money visible)
 </txt>
</msg>
<msg time='2017-11-21T13:47:54.747+08:00' org_id='oracle' comp_id='rdbms'
 msg_id='opiexe:4695:2946163730' type='UNKNOWN' group='diag_adl'
 level='16' host_id='cloud12c' host_addr='10.60.17.99'
 pid='7510'>
 <txt>create table look2 as select * from look
 </txt>
</msg>
<msg time='2017-11-21T13:50:03.002+08:00' org_id='oracle' comp_id='rdbms'
 msg_id='opiexe:4695:2946163730' type='UNKNOWN' group='diag_adl'
 level='16' host_id='cloud12c' host_addr='10.60.17.99'
 pid='7510'>
 <txt>drop table look2
 </txt>
</msg>
[oracle@cloud12c ddl]$ pwd
/u01/app/oracle/diag/rdbms/orcl/cloud/log/ddl