當克隆一個數據庫到另外一臺機器上，具有相同的數據庫名稱或者如果一個新的數據庫名稱是通過重建的控制文件，

那么需要改變DBBID，特別是如果是新的數據庫在相同的rman catalog是注冊。

尤其是如果使用rman catalog，rman catalog中只允許注冊一個DBID,相同DBID不能注冊在同一catalog當中，下面演示改變DBID：

1、關閉數據庫，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用戶可以連接

[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)----當前數據庫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.---以前的數據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.----數據庫被shutdown,以resetlogs打開。

Succesfully changed database ID.

DBNEWID - Completed succesfully.

4、打開數據庫

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

由于更改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。

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