实验环境：
操作系统 ：Oracle Linux Server release 5.7 64 bit
数据库版本：Oracle Database 10g Release 10.2.0.4.0 - 64bit Production
案例说明：
为了测试、验证备份的有效性，需要将服务器A上的数据库的备份集还原到服务器B上，服务器B上已经创建了相同名称的ORACLE_SID和DB Name，对应数据文件目录环境完全一致
Step 1： startup nomount
Step 2： restore spfile
Step 3： restore controlfile
Step 4： startup mount;
Step 5： restore database
Step 6： recover database
由 于在没有在RMAN还原时忘记设置 DBID，结果在执行recover database时报ORA-19698: /u01/oradata/SCM2/redo01.log is from different database: id=4146921064, db_name=SCM2
RMAN> recover database;
Starting recover at 14-MAY-14
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 05/14/2014 10:15:30
ORA-19698: /u01/oradata/SCM2/redo01.log is from different database: id=4146921064, db_name=SCM2
此时需要删除redo日志文件，结果在sqlplus里面删除redo日志文件，遇到下面一系列问题。其实可以直接使用rm命令直接删除redo日志文件这样简单方便得多。
SQL> alter database drop logfile group 1;
Database altered.
RMAN> recover database;
Starting recover at 14-MAY-14
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 05/14/2014 10:28:49
ORA-19698: /u01/oradata/SCM2/redo02.log is from different database: id=4146921064, db_name=SCM2
SQL> alter database drop logfile group 2;
ERROR at line 1:
ORA-01567: dropping log 2 would leave less than 2 log files for instance SCM2
(thread 1)
ORA-00312: online log 2 thread 1: '/u01/oradata/SCM2/redo02.log'
SQL> alter database add logfile group 1('/u01/oradata/SCM2/redo01.log') size 50M reuse;
Database altered.
SQL> alter database drop logfile group 2;
Database altered.
RMAN> recover database;
Starting recover at 14-MAY-14
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 05/14/2014 10:32:09
ORA-19698: /u01/oradata/SCM2/redo03.log is from different database: id=4146921064, db_name=SCM2
SQL> alter database drop logfile group 3;
alter database drop logfile group 3
*
ERROR at line 1:
ORA-01623: log 3 is current log for instance SCM2 (thread 1) - cannot drop
ORA-00312: online log 3 thread 1: '/u01/oradata/SCM2/redo03.log'
[oracle@DB-Server SCM2]$ rm redo03.log
删除redo03.log后，recover database成功
