oracle 修改dbid和dbname

一般这玩意没人修改，除非特殊情况，比如克隆数据库等等

步骤：

1.备份数据库

2.启动数据到mount状态

3.nid命令修改 （如果只是修改dbid，那么不需要dbname参数，需要更改dbname加上此参数即可，如果只修改dbname，那么需要setname参数为yes）

4.alter database open resetlogs打开数据库

nid语法以及参数含义：

ParameterDescriptionTARGETSpecifies the username and password used to connect to the database. The user must have the SYSDBA privilege. If you are using operating system authentication, then you can connect with the slash (/). If the $ORACLE_HOME and $ORACLE_SID variables are not set correctly in the environment, then you can specify a secure (IPC or BEQ) service to connect to the target database. A target database must be specified in all invocations of the DBNEWID utility.REVERTSpecify YES to indicate that a failed change of DBID should be reverted (default is NO). The utility signals an error if no change DBID operation is in progress on the target database. A successfully completed change of DBID cannot be reverted. REVERT=YES is valid only when a DBID change failed.DBNAME=new_db_nameChanges the database name of the database. You can change the DBID and the DBNAME of a database at the same time. To change only the DBNAME, also specify the SETNAME parameter.SETNAMESpecify YES to indicate that DBNEWID should change the database name of the database but should not change the DBID (default is NO). When you specify SETNAME=YES, the utility writes only to the target database control files.LOGFILE=logfileSpecifies that DBNEWID should write its messages to the specified file. By default the utility overwrites the previous log. If you specify a log file, then DBNEWID does not prompt for confirmation.APPENDSpecify YES to append log output to the existing log file (default is NO).HELPSpecify YES to print a list of the DBNEWID syntax options (default is NO).

实例：

SQL> conn /as sysdba

Connected.

SQL> select dbid from v$database;

      DBID

----------

 148366931

SQL> startup mount;

ORACLE instance started.

Total System Global Area 5049942016 bytes

Fixed Size                  2090880 bytes

Variable Size            1375733888 bytes

Database Buffers         3657433088 bytes

Redo Buffers               14684160 bytes

Database mounted.

SQL> exit

Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

oracle@readerlogdb->  nid target=sys/sys@skyread

DBNEWID: Release 10.2.0.4.0 - Production on Mon Jul 1 11:16:09 2013

Copyright (c) 1982, 2007, Oracle.  All rights reserved.

Connected to database SKYREAD (DBID=148366931)

Connected to server version 10.2.0

Control Files in database:

    /database/oradata/skyread/control01.ctl

    /database/oradata/skyread/control02.ctl

    /database/oradata/skyread/control03.ctl

Change database ID of database SKYREAD? (Y/[N]) => y

Proceeding with operation

Changing database ID from 148366931 to 277140985

    Control File /database/oradata/skyread/control01.ctl - modified

    Control File /database/oradata/skyread/control02.ctl - modified

    Control File /database/oradata/skyread/control03.ctl - modified

    Datafile /database/oradata/skyread/system01.dbf - dbid changed

    Datafile /database/oradata/skyread/tbs_test.dbf - dbid changed

    Datafile /database/oradata/skyread/sysaux01.dbf - dbid changed

    Datafile /database/oradata/skyread/users01.dbf - dbid changed

    Datafile /database/oradata/skyread/system02.dbf - dbid changed

    Datafile /database2/oradata/skyread/undotbs02.dbf - dbid changed

    Datafile /database2/oradata/skyread/TBS_MRPMUSIC01.dbf - dbid changed

    Datafile /database/oradata/skyread/sf01.dbf - dbid changed

    Control File /database/oradata/skyread/control01.ctl - dbid changed

    Control File /database/oradata/skyread/control02.ctl - dbid changed

    Control File /database/oradata/skyread/control03.ctl - dbid changed

    Instance shut down

Database ID for database SKYREAD changed to 277140985.

All previous backups and archived redo logs for this database are unusable.

Database is not aware of previous backups and archived logs in Recovery Area.

Database has been shutdown, open database with RESETLOGS option.

Succesfully changed database ID.

DBNEWID - Completed succesfully.

SQL> startup;

ORACLE instance started.

Total System Global Area 5049942016 bytes

Fixed Size                  2090880 bytes

Variable Size            1375733888 bytes

Database Buffers         3657433088 bytes

Redo Buffers               14684160 bytes

Database mounted.

ORA-01589: must use RESETLOGS or NORESETLOGS option for database open

SQL> alter database open resetlogs;

Database altered.

SQL>  select dbid from v$database;

      DBID

----------

 277140985

这里只是修改了dbid，其他的不再举例，有兴趣可以自己试验