Oracle Enterprise Manager is a set of web-based tools aimed at managing
software and hardware produced by Oracle Corporation as well as by some
non-Oracle entities. Releases
Oracle Enterprise Manager includes three releases:
= Oracle Enterprise Manager Database Control =
Oracle Enterprise Manager Database Control, the oldest and arguably the
best-known release, aims to manage Oracle databases. It originated as a
Java client able to configure and manage databases.
= Oracle Enterprise Manager Application Server Control =
Oracle Application Server also has a web-interface to manage the application
server. = Oracle Enterprise Manager Grid Control
For managing lots of databases and application servers one could use the
Oracle Enterprise Manager Grid Control. It can manage multiple instances of
Oracle deployment platforms; the most recent edition also allows for
management and monitoring of other platforms such as Microsoft .NET,
Microsoft SQL Server, NetApp Filers, BEA weblogic and others. Partners and IT
organizations can build extensions to Oracle Enterprise Manager, and make them
available to other Enterprise Manager users via on Oracle hosted web site
called Oracle Enterprise Manager Extensibility Exchange.
System monitoring features include monitoring functionality that supports
detection and notification of impending IT problems. It monitors Oracle Database
instances, Oracle Real Application Clusters, and Oracle Application Server
Farms and Clusters. OEM Grid Control comes with a set of performance and
health metrics that allow monitoring of technology components such as
applications, application servers, databases, as well as the back-end
components on which they rely, such as hosts, operating systems and storage.
The architecture of the OEM for Grid Control has three distinct components:
the collection agent the aggregation agent
the repository agent The OMA runs on the target host and
collects information on the hardware, operating system, and applications that
run on the target. The OMS runs on one or two servers and collects the data
generated by the OMAs. The OMS pulls the information from the OMAs and aggregates
the collections into the repository. The OMS also acts as the user-interface — by
generating web-pages for database administrators to view the status of
systems and services. The OMR comprises an instance of the Oracle database that
stores the data collected by the OMS. Installers can make the OMR highly
available or fault-tolerant by running it on an Oracle RAC instance across
multiple nodes. Plug-ins on each of the OMAs can
customise or manipulate the data presented by the OEM by extending the
data that the OMAs collect. Administrators can customize the
analysis of the data with "management packs" to look at specific collections
of data to display a system's performance. The current release of OEM
allows for the design and configuration of custom Plug-ins to monitor any
application desired. OMAs collect the data using the custom-built plug-in and
transmit the results in XML format back to the OMS, which then stores and
analyzes the data as desired.Oracle Enterprise Manager continues to expand
its monitoring scope by offering management plug-ins for non-Oracle
components, that are both Oracle-developed and developed in
partnership by third-party vendors. For example, Plug-ins for Veritas Storage
Foundation, VMWare vSphere, and EMC Clariion are available.
Functionality Oracle Enterprise Manager performs much
of its activity through intelligent agents which Oracle Corporation refers
to as Oracle Management Agents. These run as autonomous proxy processes on a
managed node, and perform execution and monitoring tasks for Oracle Enterprise
Manager, communicating using the Hypertext Transfer Protocol. By default,
upon installation, the OMA enables several packs without any regard to what
a customer has licensed. Users need to de-select unlicensed packs after
installing the agent on a target database.
OEM Overview Key features of OEM Grid Control:
System Monitoring Managing Groups
Job System Information Publisher
Compliance Management Extending Enterprise Manager
Managing Targets Implementation
OEM uses by default the SYSMAN schema in an Oracle database as a
super-administrator account/repository. Utility programs such as emctl or emdctl
carry out actual functions. OEM also provides a command-line alternative,
EMCLI with verbs to provide the same functionality as the UI-based EM.
Version history Enterprise Manager 12c(12.1.0.2) -
November 2011 - In this edition, Oracle stressed hybrid environments, labeling
the release 'Total Cloud Control' Enterprise Manager 11g - In this
edition, Oracle used the term 'grid' that they had been using to describe the
concept that eventually became more popularly known as 'cloud'. The release
was labeld 'Grid Control' Enterprise Manager 10g
Enterprise Manager 9i In November 2011 Oracle Corporation
announced Oracle Enterprise Manager 12c, which included the cloud-oriented Oracle
Enterprise Manager Cloud Control. External links
Official Homepage Official Oracle Enterprise Manager Blog
Unofficial Oracle Enterprise Manager Blog
Product Information Documentation
Downloads Oracle Enterprise Manager, Oracle
Enterprise Linux and Oracle VM Community & Knowledge Portal
Official Oracle Enterprise Manager Group on LinkedIn.com
Footnotes