Maclochlainn's Weblog

Michael McLaughlin's Old Technical Blog

Changing Windows hostname and Oracle Enterprise Manager

with 4 comments

One mistake can lead to a lot of work. When you’ve installed Oracle Database 11g, you can’t change the Windows Hostname without reinstalling Oracle Enterprise Manager.

These are the steps:

1. Change the %ORACLE_HOME%\network\admin\listener.ora file from an IP number to machine name.

2. Change the %ORACLE_HOME%\network\admin\tnsnames.ora file from an IP number to a machine name.

3. Change the C:\WINDOWS\System32\drivers\etc\hosts file by adding this line beneath the default localhost line:

127.0.0.1       localhost
172.16.113.128  mclaughlin11g mclaughlin11g.techtinker.com

4. Change the Windows hostname by navigating: Start > Control Panel > System (classic view) from the random assignment of VMWare Fusion.

5. Reboot the machine, and then drop the em configuration with the following commands:

C:\Data>set ORACLE_SID=orcl
C:\Data>emca -deconfig dbcontrol db -repos drop

6. You’ll receive the following prompts, enter the Oracle SID and Port number without double quotes but you must enter all passwords with double quotes (at least in Oracle Database 11g):

STARTED EMCA at Jul 13, 2008 8:26:42 AM
EM Configuration Assistant, Version 11.1.0.5.0 Production
Copyright (c) 2003, 2005, Oracle.  All rights reserved.

Enter the following information:
Database SID: orcl
Listener port number: 1521
Password for SYS user:
Password for SYSMAN user:
Password for SYSMAN user:
Do you wish to continue? [yes(Y)/no(N)]: y

7. You should then drop the SYSMAN user manually because it doesn’t happen without your assistance (or, it didn’t happen when I did it). If you don’t drop the SYSMAN schema, you’ll raise an error when you try to recreate it:

CONFIG: ORA-20001: SYSMAN already exists..
ORA-06512: at line 17

oracle.sysman.assistants.util.sqlEngine.SQLFatalErrorException: ORA-20001: SYSMAN already exists..
ORA-06512: at line 17

at oracle.sysman.assistants.util.sqlEngine.SQLEngine.executeImpl(SQLEngine.java:1530)
at oracle.sysman.assistants.util.sqlEngine.SQLEngine.executeScript(SQLEngine.java:880)
at oracle.sysman.assistants.util.sqlEngine.SQLPlusEngine.executeScript(SQLPlusEngine.java
at oracle.sysman.assistants.util.sqlEngine.SQLPlusEngine.executeScript(SQLPlusEngine.java
at oracle.sysman.emcp.EMReposConfig.createRepository(EMReposConfig.java:492)
at oracle.sysman.emcp.EMReposConfig.invoke(EMReposConfig.java:218)
at oracle.sysman.emcp.EMReposConfig.invoke(EMReposConfig.java:147)
at oracle.sysman.emcp.EMConfig.perform(EMConfig.java:222)
at oracle.sysman.emcp.EMConfigAssistant.invokeEMCA(EMConfigAssistant.java:535)
at oracle.sysman.emcp.EMConfigAssistant.performConfiguration(EMConfigAssistant.java:1215)
at oracle.sysman.emcp.EMConfigAssistant.statusMain(EMConfigAssistant.java:519)
at oracle.sysman.emcp.EMConfigAssistant.main(EMConfigAssistant.java:468)

8. You can then create the em environment with the following syntax:

C:\Data>emca -config dbcontrol db -repos create

9. Again, you’ll receive the following prompts, enter the Oracle SID and Port number without double quotes but you must enter all passwords with double quotes (at least in Oracle Database 11g):

STARTED EMCA at Jul 13, 2008 8:28:48 AM
EM Configuration Assistant, Version 11.1.0.5.0 Production
Copyright (c) 2003, 2005, Oracle.  All rights reserved.

Enter the following information:
Database SID: orcl
Listener port number: 1521
Password for SYS user:
Password for DBSNMP user:
Password for SYSMAN user:
Password for SYSMAN user: Email address for notifications (optional):
Outgoing Mail (SMTP) server for notifications (optional):
-----------------------------------------------------------------

You have specified the following settings

Database ORACLE_HOME ................ C:\app\Administrator\product\11.1.0\db_1

Local hostname ................ mclaughlin11g
Listener port number ................ 1521
Database SID ................ orcl
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............

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

Do you wish to continue? [yes(Y)/no(N)]: y

A note to me, remember haste makes waste. I’m just glad that rebuilding the MarkLogic server was easy.

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Written by maclochlainn

July 13, 2008 at 9:40 am

4 Responses

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  1. […] I went about changing things. The steps are here if you’re interested. The result is a correctly configured Oracle Enterprise Manager with a valid Windows […]

  2. […] in the C:WINDOWSsystem32driversetchosts file. I’d blogged about it earlier, describing how to drop and recreate the Enterprise Manager. I had a hunch, and it […]

  3. […] 3. Once you’ve installed the operating system and patched it to the current level, you should name your machine before installing the Oracle Database. If you forget, you can rebuild the Enterprise Manager by following the instructions in this earlier blog page. […]

  4. You also need to drop the role MGMT_USER and the public synonym that goes with it in Oracle 11g.

    James Randall

    February 1, 2010 at 9:55 pm


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