Oracle Enterprise Manager Installation Guide

Required Configuration Files

Note: Network Manager 3.1 for Windows is used to build the required network configuration files, including the topology.ora file. You can also use the Oracle Topology Generator to create the topology.ora file. In addition, you can create the files manually with an ASCII text editor.

The Oracle Enterprise Manager Console uses a Daemon process for network communication with the Oracle Intelligent Agents on remote systems. The network communication is done using Oracle's SQL*Net product.

Note: Job Scheduling, Event Management, Software Manager, and Data Manager, and TableSpace Manager rely on communication between the Console, agent, and daemon, and require SQL* Net V2.3, which is included as part of the Enterprise Manager installation. All other tasks, including local and remote login to the Enterprise Manager Repository, can be supported using an existing SQL*Net V1 installation.

SQL*Net requires a number of configuration files in order to work. On both the Console and host node, the following files are needed:

sqlnet.ora Contains configuration items such as domain name and trace level.
tnsnames.ora Contains the addresses of SQL*Net Listeners and agents.

On the Console side of the connection, the following additional file is needed:

topology.ora Contains all the SQL*Net Listeners, names servers, nodes, databases, and agents in the network.

On the host node where the Oracle database and agent reside, the following additional files are needed :

listener.ora Contains the listening addresses of the SQL*Net Listener on the machine plus the name and ORACLE_HOME of any databases the listener knows about.
snmp.ora Contains the listening address of the agent, the names of SQL*Net Listener and Oracle database services it knows about, plus tracing parameters. For information on this file, see "SNMP.ORA File" .

The Daemon reads the topology.ora file to determine what services are available in the SQL*Net network. The file is a simplified version of tnsnames.ora and snmp.ora. the format of the topology.ora file is :

name = (<type>, <location> [, <list of listeners>])

where <type> is :

ORACLE_DATABASE
ORACLE_LISTENER
ORACLE_AGENT

<location> is the name of the machine on which the service resides.

<list of listeners> is only applicable when <type> is ORACLE_DATABASE. The list contains all the Listeners that service the specified database.

No addressing information is contained in topology.ora, however any Database or Agent name that appears on the left hand side *must* have an associated entry in TNSNAMES.ORA. The Daemon will try and resolve service names in TOPOLOGY.ORA using TNSNAMES.ORA.

sqlnet.ora	Contains configuration items such as domain name and trace level.
tnsnames.ora	Contains the addresses of SQL*Net Listeners and agents.

listener.ora	Contains the listening addresses of the SQL*Net Listener on the machine plus the name and `ORACLE_HOME` of any databases the listener knows about.
snmp.ora	Contains the listening address of the agent, the names of SQL*Net Listener and Oracle database services it knows about, plus tracing parameters. For information on this file, see "SNMP.ORA File" .