Oracle RAC 执行闪回数据库操作

SQL> select to_char(scn_to_timestamp(1395475),'yyyy-mm-dd hh24:mi:ss') time_stamp from dual;TIME_STAMP-------------------2013-01-23 17:14:05SQL> flashback database to timestamp to_timestamp('2013-01-23 17:14:05','yyyy-mm-dd hh24:mi:ss');flashback database to timestamp to_timestamp('2013-01-23 17:14:05','yyyy-mm-dd hh24:mi:ss')*ERROR at line 1:ORA-38757: Database must be mounted and not open to FLASHBACK.