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Grid Control

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What is Grid Computing?

In Grid Computing, a user doesn’t care where computing occurs. Users request information or computation and have it delivered. They don’t care where or how the request was given. This is, of course, a “client-side” view. On the other hand, from the “server-side,” the Oracle Grid is about resource allocation, information sharing, and high availability.

 

What is Oracle Ecosystem?

Oracle Ecosystems are integrated communities of related Oracle components such as application All Oracle Application servers, Oracle Databases, and Oracle collaboration Suite that they are functioning as a unit.

 

What is RAC?

RAC stands for Real Application Clusters. It distributes database workload among multiple instances.

 

What is ASM?

ASM stands for Automatic Storage Management. It manages disk I/O to easily accessed and balanced across disk groups. It is like a Volume Manager.

 

What is ASLM?

ASLM stands for Application Service Level Monitoring. It monitors the overall health of an application server and Oracle database.

 

What is Oracle Enterprise Manager 10g Grid Control?

It monitors and manages farm/cluster, application server, Oracle WebCache, Oracle HTTP Server, Oracle Containers for J2EE, Single Sign-On, Portal, Wireless, Business Intelligence, and host targets.

 

What are the Grid Control Components?

The following are the Oracle Enterprise manager Grid Control components:

1- Oracle Management Repository (OMR) – It is a container. It is a collection of schema objects within an Oracle database. It contains SYSMAN’s schema objects. The OMR database listener monitors port 1521 by default for any incoming connection requests.

 

2- Oracle Management Service (OMS) – It receives information from OMA and passes them to OMR. It provides the Grid Control console Web pages from information within the OMR. It includes Oracle HTTP Server (OHS), Oracle Application Server containers for J2EE (OC4J), and OracleAS Web Cache. OracleAS Web Cache is configured to listen on port 7777 and OHS listens on port 7778 for connection by default.

 

3- Oracle Management Agent (OMA) – You need one OMA for each host server. It must be in its own ORACLE_HOME. It collects information about target availability, configuration, and performance and passes that information to OMS. In most installation, the OHS listens to OMA traffic on port 4889 by default.

 

4. ./sysman/log/. (all OMA log and trace files)

 

How to access the Grid Control console?

You use Web browser. (http://<oms host>.<domain>:<port>/em) For example: http://oracle.iselfschooling.com:7777/em.

 

What are the Grid Control Console components?

Home – It shows a big picture of system availability, alerts, jobs, and status of targets.

Targets – It shows the status of targets such as hosts, databases, applications servers, Web applications, groups, and a global view called “all targets.”

Deployments – It shows the software and hardware deployments including their patches. It manages configuration policies to ensure that you comply with generally accepted best practices.

Alerts - It shows and monitors the status of targets.

Jobs – It shows, schedules and executes user’s or administrator’s jobs.

Management System – It shows an overview of performance of your ecosystem.

 

How to start and stop the OMA?

- to start: # $AGENT_HOME/bin/emctl start agent

- to stop: # $AGENT_HOME/bin/emctl stop agent

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