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"My
heart leaps up when I behold a rainbow in the sky."
-William
Wordsworth (1770-1850)
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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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