當(dāng)克隆一個數(shù)據(jù)庫到另外一臺機器上，具有相同的數(shù)據(jù)庫名稱或者如果一個新的數(shù)據(jù)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(shù)據(jù)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(dāng)中，下面演示改變DBID：

1、關(guān)閉數(shù)據(jù)庫，啟動到mount狀態(tài)

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(rèn)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(dāng)前數(shù)據(jù)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(shù)據(jù)庫與歸檔備份現(xiàn)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(shù)據(jù)庫被shutdown,以resetlogs打開。

Succesfully changed database ID.

DBNEWID - Completed succesfully.

4、打開數(shù)據(jù)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(dǎo)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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