Oracle Enterprise Manager 10g Grid Control comprises three major components:
Oracle Management Repository (OMR)
Oracle Management Service (OMS)
Oracle Management Agent (OMA)

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Oracle Enterprise Manager 10g Grid Control comprises three major components:

• Oracle Management Repository (OMR)
• Oracle Management Service (OMS)
• Oracle Management Agent (OMA)

Key configuration files for the OMA include:
–./sysman/emd/targets.xml
–./sysman/config/emd.properties
–./sysman/config/emagentlogging.properties

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To start the Grid Control framework, do the following:
1. Start the OMR database listener
2. Start the OMR database
3. Start all OMSs
4. Start the OMA on the OMS/OMR server
5. Start the OMA on managed servers

To stop the Grid Control framework:
1. Stop the OMA on managed servers (optional).
2. Stop the OMA on the OMS/OMR server.
3. Stop all OMSs.
4. Stop the OMR database.
5. Stop the OMR database listener.

Oracle Management Agent : Must be installed on each managed host,  Must be in its own ORACLE_HOME , Communicates with the OMS via HTTP or HTTPS

Oracle Management Service : Includes member components:, Oracle HTTP Server (OHS), Oracle Application Server Containers for J2EE (OC4J), OracleAS Web Cache, Is a J2EE application deployed on Oracle Application Server 10g, Connects to the OMR by using Java Database Connectivity

Oracle Management Repository : Resides in an Oracle database, Includes schema objects belonging to SYSMAN, Can be installed in a preexisting database, Can be configured to contain other management data, including:, Oracle Application Server infrastructure database, Oracle Recovery Manager catalog

$ opmnctl startall
$ opmnctl stopall
$ opmnctl startproc ias-component=OC4J
$ opmnctl stopproc process-type=OC4J_EM
$ opmnctl status -lEnterprise Manager Control Utility (emctl)

$ emctl start oms
$ emctl stop oms
$ emctl status oms
$ emctl start iasconsole
$ emctl stop iasconsoleDistributed Configuration Manager Control (dcmctl)

$ dcmctl start
$ dcmctl start –ct WebCache
$ dcmctl stop
$ dcmctl getstate
$ dcmctl listcomponents

Example Output of Commands

$ /opt/oracle/product/oms10g/opmn/bin/opmnctl status -l

Processes in Instance: EnterpriseManager0.test
-------------------+--------------------+---------+----------+------------+----------+-----------+------
ias-component      | process-type       |     pid | status   |        uid |  memused |    uptime | ports
-------------------+--------------------+---------+----------+------------+----------+-----------+------
DSA                | DSA                |     N/A | Down     |        N/A |      N/A |       N/A | N/A
LogLoader          | logloaderd         |     N/A | Down     |        N/A |      N/A |       N/A | N/A
HTTP_Server        | HTTP_Server        |     749 | Alive    | 1325924656 |   194208 | 123:54:07 | http1:7778,http2:7200,https1:4444,https2:1159,http3:4889
dcm-daemon         | dcm-daemon         |     629 | Alive    | 1325924655 |    24956 | 123:54:39 | N/A
OC4J               | home               |   23906 | Alive    | 1325924658 |    33148 | 121:24:21 | ajp:12502,rmi:12402,jms:12602
OC4J               | OC4J_EMPROV        |   23907 | Alive    | 1325924659 |    57724 | 121:24:21 | ajp:12503,rmi:12403,jms:12603
OC4J               | OC4J_EM            |   12150 | Alive    | 1325924667 |   242044 | 1193:01:~ | ajp:12501,rmi:12401,jms:12601
WebCache           | WebCache           |   23908 | Alive    | 1325924660 |   106924 | 121:24:21 | http:7777,invalidation:9401,statistics:9402
WebCache           | WebCacheAdmin      |   23909 | Alive    | 1325924661 |    15652 | 121:24:21 | administration:9400

$ /opt/oracle/product/oms10g/opmn/bin/opmnctl status

Processes in Instance: EnterpriseManager0.test
-------------------+--------------------+---------+---------
ias-component      | process-type       |     pid | status
-------------------+--------------------+---------+---------
DSA                | DSA                |     N/A | Down
LogLoader          | logloaderd         |     N/A | Down
HTTP_Server        | HTTP_Server        |     749 | Alive
dcm-daemon         | dcm-daemon         |     629 | Alive
OC4J               | home               |   23906 | Alive
OC4J               | OC4J_EMPROV        |   23907 | Alive
OC4J               | OC4J_EM            |   12150 | Alive
WebCache           | WebCache           |   23908 | Alive
WebCache           | WebCacheAdmin      |   23909 | Alive

To Start and stop individual ias components use :  opmnctl startproc ias-component=OC4J (See IAS-Component Above)

To Start and stop individual processes use :  opmnctl startproc process-type=OC4J_EMPROV (See Process-Type Above)

$ /opt/oracle/product/oms10g/opmn/bin/opmnctl stopall
opmnctl: stopping opmn and all managed processes…
================================================================================
opmn id=test:6201
5 of 6 processes stopped. ias-instance id=EnterpriseManager0.test
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
——————————————————————————–
ias-component/process-type/process-set:
OC4J/OC4J_EM/default_island

Error
–> Process (pid=12150)
time out while waiting for a managed process to stop
Log:
/opt/oracle/product/oms10g/opmn/logs/OC4J~OC4J_EM~default_island~1

opmnctl: graceful stop of processes failed, trying forceful shutdown…

$ /opt/oracle/product/oms10g/opmn/bin/opmnctl status
Unable to connect to opmn.
Opmn may not be up.

Directory structure of Grid Control Install

1og Grid