當克隆一個資料庫到另外一臺機器上，具有相同的資料庫名稱或者如果一個新的資料庫名稱是透過重建的控制檔案，
那麼需要改變DBBID，特別是如果是新的資料庫在相同的rman catalog是註冊。
尤其是如果使用rman catalog，rman catalog中只允許註冊一個DBID,相同DBID不能註冊在同一catalog當中，下面演示改變DBID：
1、關閉資料庫，啟動到mount狀態
SYS@jzh>shu immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SYS@jzh>startup mount
ORACLE instance started.
Total System Global Area 626327552 bytes
Fixed Size 2230952 bytes
Variable Size 444597592 bytes
Database Buffers 176160768 bytes
Redo Buffers 3338240 bytes
Database mounted.
2、確認sys使用者可以連線
[oracle@jzh5 ~]$ sqlplus sys/oracle@jzh as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Sun Sep 13 08:43:52 2015
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
3、更改DBID
[oracle@jzh5 ~]$ cd $ORACLE_HOME/bin
[oracle@jzh5 bin]$ ./nid target=sys/oracle@jzh
DBNEWID: Release 11.2.0.3.0 - Production on Sun Sep 13 08:45:08 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to database JZH (DBID=233255254)----當前資料庫DBID
Connected to server version 11.2.0
Control Files in database:
/u01/app/oracle/oradata/jzh/control01.ctl
/u01/app/oracle/fast_recovery_area/jzh/control02.ctl
Change database ID of database JZH? (Y/[N]) => y----是否更改DBID，輸入Y
Proceeding with operation
Changing database ID from 233255254 to 249044244 -----DBID從233255254更改為249044244
Control File /u01/app/oracle/oradata/jzh/control01.ctl - modified
Control File /u01/app/oracle/fast_recovery_area/jzh/control02.ctl - modified
Datafile /u01/app/oracle/oradata/jzh/system01.db - dbid changed
Datafile /u01/app/oracle/oradata/jzh/sysaux01.db - dbid changed
Datafile /u01/app/oracle/oradata/jzh/undotbs01.db - dbid changed
Datafile /u01/app/oracle/oradata/jzh/users01.db - dbid changed
Datafile /u01/app/oracle/oradata/jzh/test01.db - dbid changed
Datafile /u01/app/oracle/oradata/jzh/temp01.db - dbid changed
Control File /u01/app/oracle/oradata/jzh/control01.ctl - dbid changed
Control File /u01/app/oracle/fast_recovery_area/jzh/control02.ctl - dbid changed
Instance shut down
Database ID for database JZH changed to 249044244.
All previous backups and archived redo logs for this database are unusable.---以前的資料庫與歸檔備份現在不可用
Database is not aware of previous backups and archived logs in Recovery Area.
Database has been shutdown, open database with RESETLOGS option.----資料庫被shutdown,以resetlogs開啟。
Succesfully changed database ID.
DBNEWID - Completed succesfully.
4、開啟資料庫
SYS@jzh>startup mount
ORACLE instance started.
Total System Global Area 626327552 bytes
Fixed Size 2230952 bytes
Variable Size 444597592 bytes
Database Buffers 176160768 bytes
Redo Buffers 3338240 bytes
Database mounted.
SYS@jzh>alter database open resetlogs;
Database altered.
5、檢查新的DBID
[oracle@jzh5 ~]$ rman target /
Recovery Manager: Release 11.2.0.3.0 - Production on Sun Sep 13 08:50:45 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: JZH (DBID=249044244)----新的DBID
由於更改DBID會導致以前的備份失效，因此在更改DBID時還需要慎重考慮。

更改資料庫DBID

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