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.
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
for Application Service Level Monitoring. It
monitors the overall health of an
application server and Oracle database.
Oracle Enterprise Manager 10g Grid Control?
and manages farm/cluster, application
server, Oracle WebCache, Oracle HTTP Server,
Oracle Containers for J2EE, Single Sign-On,
Portal, Wireless, Business Intelligence, and
the Grid Control Components?
are the Oracle Enterprise manager Grid
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
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
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.
(all OMA log and trace files)
access the Grid Control console?
You use Web
browser. (http://<oms host>.<domain>:<port>/em)
the Grid Control Console components?
Home – It
shows a big picture of system
availability, alerts, jobs, and status
Targets – It
shows the status of targets such as
hosts, databases, applications servers,
Web applications, groups, and a global
view called “all targets.”
It shows the software and hardware
deployments including their patches. It
manages configuration policies to ensure
that you comply with generally accepted
Alerts - It
shows and monitors the status of
Jobs – It
shows, schedules and executes user’s or
System – It shows an overview of performance
of your ecosystem.
start and stop the OMA?
- to start: #
$AGENT_HOME/bin/emctl start agent
- to stop: # $AGENT_HOME/bin/emctl