DBNEWID 是一个数据库实用程序，用于更改 Oracle 数据库的 DBNAME 和 DBID。可以更改 DBID 或 DBNAME 或两者。
DBNAME 是在创建数据库时指定的数据库名称，DBID 是创建数据库时分配给数据库的唯一编号。
以下步骤演示如何使用 DBNEWID 实用程序更改 Oracle 数据库的 DBNAME 和 DBID。
重要提示：开始此过程之前，请确保拥有数据库的完整备份。
Step 1：开始之前，找出数据库当前的 DBNAME 和 DBID：

SQL> SELECT DBID,NAME from V$DATABASE;DBID NAME
---------- ---------
2426088413 MYORDB

Step 2：第一步是启动实例并挂载数据库，但不打开数据库。

sqlplus / as sysdbaSQL> shutdown immediateDatabase closed.Database dismounted.ORACLE instance shut down.SQL> startup mount
ORACLE instance started.Total System Global Area 1071333376 bytes
Fixed Size                  1375792 bytes
Variable Size             553648592 bytes
Database Buffers          511705088 bytes
Redo Buffers                4603904 bytes
Database mounted.SQL> exit
Disconnected from Oracle Database 11g Release 11.2.0.1.0 - Production

Step 3. 通过指定连接字符串和数据库的新名称来运行 DBNEWID 实用程序。 连接字符串中指定的用户应具有 SYSDBA 权限。

nid target=sys/MYPASS@MYORDB dbname=MYNEWDB setname=YES
DBNEWID: Release 11.2.0.1.0 - Production on Tue May 30 12:50:01 2015
Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.Connected to database MYORDB (DBID=2436089413)Connected to server version 11.2.0Control Files in database:C:ORADATAMYORDBCONTROL01.CTLC:ORADATAMYORDBCONTROL02.CTLChange database name of database MYORDB to MYNEWDB? (Y/[N]) => YProceeding with operation
Changing database name from MYORDB to MYNEWDBControl File C:ORADATAMYORDBCONTROL01.CTL - modifiedDatafile C:ORADATAMYORDBSYSTEM01.DB - wrote new nameDatafile C:ORADATAMYORDBSYSAUX01.DB - wrote new nameDatafile C:ORADATAMYORDBUNDOTBS01.DB - wrote new nameDatafile C:ORADATAMYORDBUSERS01.DB - wrote new nameDatafile C:ORADATAMYORDBMYORDBDAT01.DB - wrote new nameDatafile C:ORADATAMYORDBMYORDBIDX01.DB - wrote new nameDatafile C:ORADATAMYORDBTEMP01.DB - wrote new nameControl File C:ORADATAMYORDBCONTROL01.CTL - wrote new nameControl File C:ORADATAMYORDBCONTROL02.CTL - wrote new nameInstance shut downDatabase name changed to MYNEWDB.
Modify parameter file and generate a new password file before restarting.
Succesfully changed database name.
DBNEWID - Completed succesfully.

Step 4: Shut down the database.

SQL> shutdown immediate

Step 5：将初始化参数文件中的DB_NAME初始化参数设置为新的数据库名称。

sqlplus / as sysdbaSQL> show parameter db_name
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_name                              string      MYORDBSQL> alter system set db_name=MYNEWDB scope=spfile;
System altered.

Step 6: 创建一个新的密码文件。

orapwd file=orapwMYNEWDB password=MYPASS

Step 7: 启动DB

SQL> startup mount

Step 8：验证名称更改

SELECT DBID,NAME from V$DATABASE;DBID NAME
---------- ---------
2426088413 MYNEWDB