Sunday, April 13, 2008

Manually configure the Oracle 10g EM dbconsole

Overview

When you choose to create a preconfigured database during the Oracle 10g installation, you can select the Oracle Enterprise Manager (OEM) interface that you want to use to manage the database. The following options are available:

Database Grid Control
This option is available only if an Oracle Management Agent is installed on the system. When the Installer detects an Oracle Management Agent on the system, it allows you to choose this option and specify the Oracle Management Service that you want to use to manage the database. If an Oracle Management Agent is not installed, you must choose to use Database Control to manage the database. However, if you install Oracle Management Agent after you install Oracle Database, you can then use Grid Control to manage this database.

Database Control

This option is selected by default if an Oracle Management Agent is not installed on the system. However, even if a Management Agent is installed, you can still choose to configure Database Control to manage the database.

Custom installation

If you choose the Custom installation type or the Advanced database configuration option during the installation, the Installer does not display the OEM setup screens. Instead, it runs the Database Configuration Assistant (DBCA) in interactive mode, which enables you to create a custom database.

DBCA also enables you to specify the Oracle Enterprise Manager interface that you want to use. Furthermore, you can also use DBCA after the installation to configure Database Control for a database that was not previously configured to use it.

However, if you decide to setup your own Database, you must install the Database Control manually.

Setup your own Database and manually install the Database Control

The Database Control relies on various underlying technologies to discover, monitor, and administer the Oracle Database environment.

From the Database Control, you can monitor and administer a single Oracle Database instance.

The Database Control Framework consists of the Database Control and its underlying technologies:

A local version of the Oracle Management Service designed to work with the local database or clustered database.

A local Oracle Management Repository installed in the local database and designed to store management data for the Database Control.

The following steps have to be performed.



Create the Database Control Repository and setup the OC4J Application Server

Make sure, that you can connect to the Repository Database (Test it with SQL*Plus). Examples for Setup Files can be found here:

Windows
LISTENER.ORA
SQLNET.ORA
TNSNAMES.ORA

Linux
listener.ora
sqlnet.ora
tnsnames.ora

Now start the Oracle EM dbconsole Build Script ($ORACLE_HOME/bin/emca for Linux and $ORACLE_HOME\Bin\emca.bat for Windows).

$ emctl stop dbconsole -- stop EM
$ emca -repos drop -- drop EM repository
$ emca -repos create -- create EM repository
$ emca -config dbcontrol db -- configure dbcontrol
$emca -r auto configure

$ emctl stop dbconsole -- stop EM
$emca -repos recreate -- recreate EM repository
$emca -deconfig dbcontrol db -- deconfigure dbcontrol
$emca -config dbcontrol db -- configure dbcontrol


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