解释并解决了此问题！摘要如下：
"RMAN creates a copy of the controlfile for read consistency, this is the snapshot controlfile. Due to the changesmade to the controlfile backup mechanism in 11gR2 any instances in the clustermay write to the snapshot controlfile. Therefore, the snapshot controlfile fileneeds to be visible to all instances.
The same happens when a backup of thecontrolfile is created directly from sqlplus any instance in the cluster maywrite to the backup controfile file.
In 11gR2 onwards, the controlfile backuphappens without holding the control file enqueue. For non-RAC database, thisdoesn't change anything.
But, for RAC database, the snapshotcontrolfile location must be in a shared file system that will be accessible fromall the nodes."
当前的控制文件配置：
RMAN> show all;
using target database control file insteadof recovery catalog
RMAN configuration parameters for databasewith db_unique_name OSDB are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1;# default
CONFIGURE BACKUP OPTIMIZATION OFF; #default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; #default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; #default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FORDEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICETYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FORDEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; #default
CONFIGURE ENCRYPTION FOR DATABASE OFF; #default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; #default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' ASOF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TONONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO'/soft/product/11.2.0.2/dbh/dbs/snapcf_osdb1.f'; # default
由於我們使用的是ASM，所以可以使用如下配置解决此问题，也可以把ASM替換成共享目錄：
RMAN> CONFIGURE SNAPSHOT CONTROLFILE NAME TO'+SFRA/sncforcl_osdb.ora';
new RMAN configuration parameters:
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+SFRA/sncforcl_osdb.ora';
new RMAN configuration parameters aresuccessfully stored
RMAN> show all;
RMAN configuration parameters for databasewith db_unique_name OSDB are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1;# default
CONFIGURE BACKUP OPTIMIZATION OFF; #default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; #default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; #default
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FORDEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICETYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FORDEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; #default
CONFIGURE ENCRYPTION FOR DATABASE OFF; #default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; #default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' ASOF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TONONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+SFRA/sncforcl_osdb.ora';
附件：
In this Document
Oracle Server - Enterprise Edition - Version 11.2.0.1.0 and later
Information in thisdocument applies to any platform.
This issue is onlyapplicable to RAC database.
From 11gR2 onwards,the controlfile backup happens without holding the controlfile enqueue. Fornon-RAC database, this doesn't change anything. But for RAC database, due tothe changes made to the con