How to Change the DBID and the DBNAME by using NID [ID 224266.1]

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How to Change the DBID and the DBNAME by using NID [ID 224266.1]

Modified 16-JUL-2009 Type PROBLEM Status PUBLISHED

Checked for relevance on 05-March-08

Introduction

============

The NID (New Database ID)is a new utility introduced with Oracle 9.2. The NID

utility allows you to change only the DBNAME, or only the DBID or both

DBNAME and DBID in the same command.

1. If you change the DBID you must open the database with the RESETLOGS

option, which re-creates the online redo logs and resets their sequence

to 1.

2. If you change the DBNAME without changing the DBID then this does not

require you to open with the RESETLOGS option, so database backups and

archived logs are not invalidated. You must change the DB_NAME initialization

parameter after a database name change to reflect the new name. Also,

you may have to re-create the Oracle password file. If you restore an old

backup of the control file (before the name change, then you should

use the initialization parameter file and password file from before the

database name change.

Purpose

=======

It is useful to troubleshoot from the situation when duplicate database ID's

cause errors such as the following.

RMAN-20002: target database already registered in recovery catalog

Cause: target database is already registered in the recovery catalog

Action: If the target database is really registered, there is no need to

all databases have a unique DBID. If the new database was created

by copying files from an existing database, it will have the same

DBID as the original database and cannot be registered in the

same recovery catalog.

RMAN-20011, 1, "target database incarnation is not current in recovery catalog"

RMAN-20009, 1, "database incarnation already registered"

-or-

SQLPLUS> alter database mount standby database;

alter database mount standby database

ORA-01102: cannot mount database in EXCLUSIVE mode

Restrictions and Usage Notes

============================

The DBNEWID utility has the following restrictions:

- The utility is available only on the UNIX and Windows NT operating systems.

- The NID executable file should be owned and run by the Oracle owner because

it needs direct access to the datafiles and control files.

- If another user runs the utility, then set the user ID to the owner of the datafiles and control files.

- The DBNEWID utility must access the datafiles of the database directly through a local connection.

Although DBNEWID can accept a net service name, it cannot change the DBID of a nonlocal database.

- To change the DBID of a database, the database must be mounted and must have been shut down consistently

prior to mounting. In the case of an Oracle Real Application Clusters database, the database must be

mounted in NOPARALLEL mode. i.e set the init parameter CLUSTER_DATABASE=FALSE and then mount the database

- You must open the database with the RESETLOGS option after changing the DBID.

- Note that you do not have to open with the RESETLOGS option after changing only the database name.

- No other process should be running against the database when DBNEWID is executing.

If another session shuts down and starts the database, then DBNEWID aborts.

- All online datafiles should be consistent without needing recovery.

- Normal offline datafiles should be accessible and writable.

If this is not the case, you must drop these files before invoking the DBNEWID utility.

- All read-only tablespaces must be accessible and made writable at the operating system level prior

to invoking DBNEWID. If these tablespaces cannot be made writable (for example, they are on a CD-ROM),

then you must unplug the tablespaces using the transportable tablespace feature and then plug them back

in the database before invoking the DBNEWID utility (see the Oracle9i Database Administrator's Guide).

- You can only specify REVERT when changing only the DBID.

Change Only the DBID

====================

1. Backup the database

2. SHUTDOWN IMMEDIATE of the database

3. STARTUP MOUNT

4. Open one session and run NID with sysdba privileges

% nid TARGET=SYS/password@test_db

5. Shutdown IMMEDIATE of the database

6. Set the DB_NAME initialization parameter in the initialization parameter

file to the new database name

7. Create a new password file

8. Startup of the database with open resetlogs

Example:

========

1. C:/>set ORACLE_SID=TEST1BY

C:/>sqlplus "/as sysdba"

SQL*Plus: Release 9.2.0.1.0 - Production on Tue Dec 24 11:16:52 2002

Connected to an idle instance.

SQL> startup pfile=D:/oracle/admin/TEST1BY/pfile/initTEST1BY.ora

ORACLE instance started.

Total System Global Area 135338868 bytes

Fixed Size 453492 bytes

Variable Size 109051904 bytes

Database Buffers 25165824 bytes

Redo Buffers 667648 bytes

Database mounted.

Database opened.

2. check the DBID before change

SQL> select dbid,name,open_mode,activation#,created from v$database;

DBID NAME OPEN_MODE ACTIVATION# CREATED

---------- --------- ---------- ----------- ---------

1395399949 TEST1BY READ WRITE 1395404134 10-SEP-02

3. SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

4. SQL> startup mount pfile=D:/oracle/admin/TEST1BY/pfile/initTEST1BY.ora

ORACLE instance started.

Total System Global Area 135338868 bytes

Fixed Size 453492 bytes

Variable Size 109051904 bytes

Database Buffers 25165824 bytes

Redo Buffers 667648 bytes

Database mounted.

SQL>exit

5. execute NID

C:/>nid target=sys/oracle@TEST1BY

DBNEWID: Release 9.2.0.1.0 - Production

Connected to database TEST1BY (DBID=1395399949)

Control Files in database:

D:/ORACLE/BASE_TEST/TEST1BYCONTROL01.CTL

Change database ID of database TEST1BY? (Y/[N]) => y

Proceeding with operation

Changing database ID from 1395399949 to 1397190693

Control File D:/ORACLE/BASE_TEST/TEST1BYCONTROL01.CTL - modified

Datafile D:/ORACLE/BASE_TEST/TEST1BY/SYSTEM01.DBF - dbid changed

Datafile D:/ORACLE/BASE_TEST/TEST1BY/UNDOTBS01.DBF - dbid changed

Datafile D:/ORACLE/BASE_TEST/TEST1BY/DRSYS01.DBF - dbid changed

Datafile D:/ORACLE/BASE_TEST/TEST1BY/EXAMPLE01.DBF - dbid changed

Datafile D:/ORACLE/BASE_TEST/TEST1BY/INDX01.DBF - dbid changed

Datafile D:/ORACLE/BASE_TEST/TEST1BY/TOOLS01.DBF - dbid changed

Datafile D:/ORACLE/BASE_TEST/TEST1BY/USERS01.DBF - dbid changed

Datafile D:/ORACLE/BASE_TEST/TEST1BY/XDB01.DBF - dbid changed

Control File D:/ORACLE/BASE_TEST/TEST1BYCONTROL01.CTL - dbid changed

Database ID for database TEST1BY changed to 1397190693.

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

Shut down database and open with RESETLOGS option.

Succesfully changed database ID.

DBNEWID - Completed succesfully.

6. SQL> shutdown immediate;

ORA-01109: database not open

Database dismounted.

ORACLE instance shut down.

7. create the new passwordfile

8. SQL> startup mount pfile=D:/oracle/admin/TEST1BY/pfile/initTEST1BY.ora

ORACLE instance started.

Total System Global Area 135338868 bytes

Fixed Size 453492 bytes

Variable Size 109051904 bytes

Database Buffers 25165824 bytes

Redo Buffers 667648 bytes

Database mounted.

9. SQL> alter database open resetlogs;

Database altered.

10. check the new DBID

SQL> select dbid,name,open_mode,activation#,created from v$database;

DBID NAME OPEN_MODE ACTIVATION# CREATED

---------- --------- ---------- ----------- ---------

1397190693 TEST1BY READ WRITE 1397188261 10-SEP-02

NOTE: The NID change the OLD DBID 1395399949 to the NEW DBID 1397190693

Change Only the DBNAME

======================

1. Backup the database

2. SHUTDOWN IMMEDIATE of the database

3. STARTUP MOUNT

4. Open one session and run NID with sysdba privileges

% nid TARGET=SYS/password@test_db DBNAME=test_db2 SETNAME=Y

- the value of DBNAME is the new dbname of the database

- SETNAME must be set to Y. The default is N and causes the

DBID to be changed also.

5. shutdown IMMEDIATE of the database

6. Set the DB_NAME initialization parameter in the initialization parameter

file to the new database name

7. Create a new password file

8. Startup of the database(without resetlogs)

Change Both DBID and DBNAME

===========================

1. Backup of the database.

2. Shutdown IMMEDIATE of the database

3. STARTUP MOUNT

4. Open one session and run NID with sysdba privileges

% nid TARGET=SYS/password@test_db DBNAME=test_db2

- the value of DBNAME is the new dbname of the database

5. After DBNEWID successfully changes the DBID,Shutdown IMMEDIATE of the database

6. Set the DB_NAME initialization parameter in the

initialization parameter file to the new database name.

7. Create a new password file.

8. Startup of the database with open resetlogs

Example:

========

1. Shutdown the databse

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

2. Mount the database

SQL> startup mount pfile=d:/oracle/admin/test1by/pfile/inittest1by.ora

ORACLE instance started.

Total System Global Area 135338868 bytes

Fixed Size 453492 bytes

Variable Size 109051904 bytes

Database Buffers 25165824 bytes

Redo Buffers 667648 bytes

Database mounted.

startup mount

3. Run NID utility

C:/>nid target=sys/oracle@test1 dbname=test1by logfile=d:/oracle/base_test/nid.log

DBNEWID: Release 9.2.0.1.0 - Production

Connected to database TEST1 (DBID=849281895)

Control Files in database:

D:/ORACLE/BASE_TEST/TEST1BYCONTROL01.CTL

Changing database ID from 849281895 to 1395399949

Changing database name from TEST1 to TEST1BY

Control File D:/ORACLE/BASE_TEST/TEST1BYCONTROL01.CTL - modified

Datafile D:/ORACLE/BASE_TEST/TEST1BY/SYSTEM01.DBF - dbid changed, wrote new name

Datafile D:/ORACLE/BASE_TEST/TEST1BY/UNDOTBS01.DBF - dbid changed, wrote new name

Datafile D:/ORACLE/BASE_TEST/TEST1BY/DRSYS01.DBF - dbid changed, wrote new name

Datafile D:/ORACLE/BASE_TEST/TEST1BY/EXAMPLE01.DBF - dbid changed, wrote new name

Datafile D:/ORACLE/BASE_TEST/TEST1BY/INDX01.DBF - dbid changed, wrote new name

Datafile D:/ORACLE/BASE_TEST/TEST1BY/TOOLS01.DBF - dbid changed, wrote new name

Datafile D:/ORACLE/BASE_TEST/TEST1BY/USERS01.DBF - dbid changed, wrote new name

Datafile D:/ORACLE/BASE_TEST/TEST1BY/XDB01.DBF - dbid changed, wrote new name

Control File D:/ORACLE/BASE_TEST/TEST1BYCONTROL01.CTL - dbid changed, wrote new name

Database name changed to TEST1BY.

Modify parameter file and generate a new password file before restarting.

Database ID for database TEST1BY changed to 1395399949.

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.

4. Shutdown immediate of the database

5. Modfiy the file init.ora of the database

change the parameter BD_NAME=TEST1 TO DBNAME=TEST1BY

6. create a new password file

Usage: orapwd file=<fname> password=<password> entries=<users>

where

file - name of password file (mand),

password - password for SYS (mand),

entries - maximum number of distinct DBA and OPERs (opt),

7. mount the database

SQL> startup mount pfile=d:/oracle/admin/test1by/pfile/inittest1by.ora

ORACLE instance started.

Total System Global Area 135338868 bytes

Fixed Size 453492 bytes

Variable Size 109051904 bytes

Database Buffers 25165824 bytes

Redo Buffers 667648 bytes

Database mounted.

8. Open the databse with RESETLOGS

SQL> alter database open resetlogs;

Database altered.

9. check the dictionary view for the new DBID and DBNAME

select dbid, name, open_mode, activation#, created from v$database;

Other Useful Information

========================

Except the parameters like LOGFILE=, APPEND, HELP, there is a specific option

REVERT which allows us to go back on the steps of executing. If the value of

REVERT is YES that means that a failed change of DBID should be reverted but a

successfully completed change of DBID cannot be reverted. REVERT=YES is only

valid when a DBID change failed. Default value is NO.

In 10.2 and higher the database may automatically shut down after a change.

Do not be alarmed if this occurs.

Documentation

=============

Oracle9i Database Utilities Release 2 (9.2)

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