12c及之前，我们可以通过flashback或TSPITR进行恢复，12c中可以在线恢复table .

Prior to recovering a table or table partition, you must perform a full backup of undo,
SYSTEM, SYSAUX, SYSEXT (if the SYSEXT tablespace exists in your database) and the tablespace
that contains the table or table partition.

这里我们对整个CDB及所有PDB进行备份 。
SQL> alter session set container=plugdb ;
Session altered.

SQL> select to_char(dbms_flashback.get_system_change_number) CURRENT_SCN, to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') CURRENT_TIME FROM DUAL;

CURRENT_SCN                              CURRENT_TIME
---------------------------------------- -------------------
12138230128883                           2014-03-07 12:02:23

SQL> select  count(1) from  hw.HW_PAY_GROUP_LOG ;

  COUNT(1)
----------
    330458

备份CDB和所有PDBs :
rman   target    / 
RMAN> backup incremental level 0 database format '/data01/tmp/fullbak2/backup_%d%T%s.bak' plus archivelog format '/data01/tmp/fullbak2/arc_%d%T%s.bak';

假设不小心删除掉了表中的多笔记录
SQL> alter session set container=plugdb ;
Session altered.
SQL> show con_name
CON_NAME
------------------------------
PLUGDB
SQL> select  count(1) from  hw.HW_PAY_GROUP_LOG ;
  COUNT(1)
----------
    330438
SQL>

查看12c目标数据库处于归档模式 
SQL> archive log list
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            /data01/oracle12c/oradata/test12/arch
Oldest online log sequence     3
Next log sequence to archive   5
Current log sequence           5