CREATE TABLE <TABLE_NAME>
NOLOGGING
AS
 SELECT * FROM <VERY_BIG_TABLE> WHERE <CONDITION>=<VALUE>;

SQL> SELECT force_logging FROM v$database;
FOR
---
YES

CTAS is ALWAYS done in no logging mode and that the NOLOGGING option only set the LOGGING table property to NO for subsequent operations.

SQL> select  value
  2    from  v$sesstat a,
  3          v$statname b
  4    where a.statistic# = b.statistic#
  5      and b.name = 'redo size'
  6      and a.sid = sys_context('userenv','sid')
  7  /

     VALUE
----------
  48942740

SQL> create table tbl1
  2    as
  3      select  *
  4        from  dba_objects
  5  /

Table created.

SQL> select  value
  2    from  v$sesstat a,
  3          v$statname b
  4    where a.statistic# = b.statistic#
  5      and b.name = 'redo size'
  6      and a.sid = sys_context('userenv','sid')
  7  /

     VALUE
----------
  65177460

SQL> create table tbl2
  2    NOLOGGING
  3    as
  4      select  *
  5        from  dba_objects
  6  /

Table created.

SQL> select  value
  2    from  v$sesstat a,
  3          v$statname b
  4    where a.statistic# = b.statistic#
  5      and b.name = 'redo size'
  6      and a.sid = sys_context('userenv','sid')
  7  /

     VALUE
----------
  65601612

SQL> select  65177460 - 48942740 "tbl1 redo",
  2          65601612 - 65177460 "tbl2 redo"
  3    from  dual
  4  /

 tbl1 redo  tbl2 redo
---------- ----------
  16234720     424152

SQL>  

sqlplus username/password@proddb

SQL*Plus: Release 11.2.0.3.0 Production on Sat Dec 27 10:01:58 2014

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> SELECT VALUE
  FROM v$sesstat a, v$statname b
 WHERE     a.statistic# = b.statistic#
       AND b.name = 'redo size'
       AND a.sid = SYS_CONTEXT ('userenv', 'sid');

     VALUE
----------
         0

SQL> CREATE TABLE tbl1
AS
   SELECT * FROM dba_objects;

Table created.

SQL> SELECT VALUE
  FROM v$sesstat a, v$statname b
 WHERE     a.statistic# = b.statistic#
       AND b.name = 'redo size'
       AND a.sid = SYS_CONTEXT ('userenv', 'sid');

     VALUE
----------
  14866160

SQL> CREATE TABLE tbl2
NOLOGGING
AS
   SELECT * FROM dba_objects;

Table created.

SQL> SELECT VALUE
  FROM v$sesstat a, v$statname b
 WHERE     a.statistic# = b.statistic#
       AND b.name = 'redo size'
       AND a.sid = SYS_CONTEXT ('userenv', 'sid');

     VALUE
----------
  29728832

SQL> select  29728832 - 14866160 from dual;

29728832-14866160
-----------------
         14862672