错误信息：

RMAN-00571: ====================================
RMAN-00569: ====== ERROR MESSAGE STACK FOLLOWS ======
RMAN-00571: ====================================
RMAN-03002: failure of recover command at 05/23/2008 09:38:48
ORA-19693: backup piece /opt/oracle/admin/mnt_new/HERMES_NEW/2008-05-23.00-00-01/jrjh24rf_1_1 already included
通过list backupset of archivelog all;命令发现控制文件中对backuppiece /opt/oracle/admin/mnt_new/HERMES_NEW/2008-05-23.00-00-01/jrjh24rf_1_1有两条记录，于是试图去uncatalog，结果出错：

RMAN> change backuppiece '/opt/oracle/admin/mnt_new/HERMES_NEW/2008-05-23.00-00-01/jrjh24rf_1_1' uncatalog;

RMAN-00571: ====================================
RMAN-00569: ====== ERROR MESSAGE STACK FOLLOWS ======
RMAN-00571: ====================================
RMAN-03002: failure of uncatalog command at 05/23/2008 10:00:30
RMAN-20261: ambiguous backup piece handle
RMAN-06092: error while looking up backup piece

怎么办呢？于是将backuppiece移到别的地方，执行crosscheck backupset of archivelog all;和delete expired backupset of archivelog all;然后将backuppiece移回来并执行catalog backuppiece '/opt/oracle/admin/mnt_new/HERMES_NEW/2008-05-23.00-00-01/jrjh24rf_1_1';最后执行恢复，一切OK。

为什么控制文件包含两条该backuppiece的记录呢？这是因为触发了BUG 4483368。该BUG可能在ASM上的DATABASE上使用catalog start 命令时触发：SEVERAL RMAN CATALOG START WITH CREATES DUPLICATE CATALOG ENTRIES