Prior to the introduction of the DBNEWID utility alteration of the internal DBID of an instance was impossible and alteration of the DBNAME required the creation of a new controlfile. The DBNEWID utility allows the DBID to be altered for the first time and makes changing the DBNAME simpler. Changing the DBID is necessary when you want to use an RMAN catalog to backup a cloned instance. RMAN identifies instances using the DBID, preventing the original and cloned instance being managed by the same catalog. Alteration of the BID in the cloned instance removes this restriction.

• DBID And DBNAME
• DBNAME Only
• DBID Only

DBID And DBNAME

• Backup the database.
• Mount the database after a clean shutdown:
  

  SHUTDOWN IMMEDIATE
  STARTUP MOUNT

• Invoke the DBNEWID utility (nid) specifying the new DBNAME from the command line using a user with SYSDBA privilege:
  

  nid TARGET=sys/password@TSH1 DBNAME=TSH2

  Assuming the validation is successful the utility prompts for confirmation before performing the actions. Typical output may look something like:
  

  C:\oracle\920\bin>nid TARGET=sys/password@TSH1 DBNAME=TSH2
  DBNEWID: Release 9.2.0.3.0 - Production
  Copyright (c) 1995, 2002, Oracle Corporation.  All rights reserved.
  
  Connected to database TSH1 (DBID=1024166118)
  
  Control Files in database:
      C:\ORACLE\ORADATA\TSH1\CONTROL01.CTL
      C:\ORACLE\ORADATA\TSH1\CONTROL02.CTL
      C:\ORACLE\ORADATA\TSH1\CONTROL03.CTL
  
  Change database ID and database name TSH1 to TSH2? (Y/[N]) => Y
  
  Proceeding with operation
  Changing database ID from 1024166118 to 1317278975
  Changing database name from TSH1 to TSH2
      Control File C:\ORACLE\ORADATA\TSH1\CONTROL01.CTL - modified
      Control File C:\ORACLE\ORADATA\TSH1\CONTROL02.CTL - modified
      Control File C:\ORACLE\ORADATA\TSH1\CONTROL03.CTL - modified
      Datafile C:\ORACLE\ORADATA\TSH1\SYSTEM01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\UNDOTBS01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\CWMLITE01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\DRSYS01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\EXAMPLE01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\INDX01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\ODM01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\TOOLS01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\USERS01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\XDB01.DBF - dbid changed, wrote new name
      Datafile C:\ORACLE\ORADATA\TSH1\TEMP01.DBF - dbid changed, wrote new name
      Control File C:\ORACLE\ORADATA\TSH1\CONTROL01.CTL - dbid changed, wrote new name
      Control File C:\ORACLE\ORADATA\TSH1\CONTROL02.CTL - dbid changed, wrote new name
      Control File C:\ORACLE\ORADATA\TSH1\CONTROL03.CTL - dbid changed, wrote new name
  
  Database name changed to TSH2.
  Modify parameter file and generate a new password file before restarting.
  Database ID for database TSH2 changed to 1317278975.
  All previous backups and archived redo logs for this database are unusable.
  Shut down database and open with RESETLOGS option.
  Succesfully changed database name and ID.
  DBNEWID - Completed succesfully.

• Shutdown the database:
  

  SHUTDOWN IMMEDIATE

• Modify the DB_NAME parameter in the initialization parameter file. The startup will result in an error but proceed anyway.

  STARTUP MOUNT
  ALTER SYSTEM SET DB_NAME=TSH2 SCOPE=SPFILE;
  SHUTDOWN IMMEDIATE

• Create a new password file:
  

  orapwd file=c:\oracle\920\database\pwdTSH2.ora password=password entries=10

• Rename the SPFILE to match the new DBNAME.
• If you are using Windows you must recreate the service so the correct name and parameter file are used:
  

  oradim -delete -sid TSH1
  oradim -new -sid TSH2 -intpwd password -startmode a -pfile c:\oracle\920\database\spfileTSH2.ora

  If you are using UNIX/Linux simply reset the ORACLE_SID environment variable:
  

  ORACLE_SID=TSH2; export ORACLE_SID

• Alter the listener.ora and tnsnames.ora setting to match the new database name and restart the listener:
  

  lsnrctl reload

• Open the database with RESETLOGS:
  

  STARTUP MOUNT
  ALTER DATABASE OPEN RESETLOGS;

• Backup the database.

DBNAME Only

Repeat the process as before except use the following command to start the DBNEWID utility:

nid TARGET=sys/password@TSH2 DBNAME=TSH3 SETNAME=YES

The SETNAME parameter tells the DBNEWID utility to only alter the database name.

When opening the database the RESETLOGS option is not needed so the database can be started using the STARTUP command.

DBID Only

• Backup the database.
• Mount the database after a clean shutdown:
  

  SHUTDOWN IMMEDIATE
  STARTUP MOUNT

• Invoke the DBNEWID utility (nid) from the command line using a user with SYSDBA privilege. Do not specify a new DBNAME:
  

  nid TARGET=sys/password@TSH3

• Shutdown and open the database with RESETLOGS:
  

  SHUTDOWN IMMEDIATE
  STARTUP MOUNT
  ALTER DATABASE OPEN RESETLOGS;

• Backup the database.

For further information see:

• DBNEWID Utility

文章出自:http://www.oracle-base.com/articles/9i/DBNEWID.php