RMAN> duplicate target database to testerdb;
Starting Duplicate Db at 27-OCT-04
using target database controlfile instead of recovery catalog
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: sid=9 devtype=DISK
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 10/27/2004 09:31:43
ORA-01405: fetched column value is NULL
解決辦法： alter system switch logfile