Oracle Enterprise Manager

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The computer application Oracle Enterprise Manager (OEM or EM) aims to manage software 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 (according to Oracle Corporation, preferably in a grid solution) 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 Oracle Enterprise Manager 10g Grid Control Extensions Exchange. System monitoring:

Enterprise Manager provides comprehensive, flexible, easy-to-use monitoring functionality that supports the timely detection and notification of impending IT problems to the intended users. It offers the most comprehensive monitoring from Oracle Database instances to Oracle Real Application Clusters to Oracle Application Server Farms and Clusters. OEM Grid Control comes with a comprehensive set of performance and health metrics that allow monitoring of key components in your environment 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:

  1. the collection agent (Oracle Management Agent or OMA)
  2. the aggregation agent (Oracle Management Server or OMS)
  3. the repository agent (Oracle Management Repository or OMR)

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 (VxVM, VxFS) and Veritas Cluster Server (VCS), were announced and released on November 12, 2007, at Oracle OpenWorld.

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 (HTTP or HTTPS). Oracle Release 10g has 14 additional packs (plug-ins) which require separate licensing. By default, upon installation, the OMA enables several packs (Change Management, Performance & Tuning, Diagnostics and Configuration Management) 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.[1] OEM also provides a command-line alternative, EMCLI (EM command line interface) with verbs to provide the same functionality as the UI-based EM.

Version history

In November 2011 Oracle Corporation announced Oracle Enterprise Manager 12c, which included the cloud-oriented Oracle Enterprise Manager Cloud Control.[2]

External links

Footnotes

  1. ↑ Oracle Executables
  2. ↑ "Oracle Unveils Oracle Enterprise Manager 12c". Biztech2.com (Biztech2.com India). 2011-11-18. Retrieved 2011-12-07. "Oracle has announced Oracle Enterprise Manager 12c the industry’s first solution to combine management of the full Oracle stack with complete enterprise cloud lifecycle management. [...] Oracle Enterprise Manager 12c brings together management capabilities for the entire cloud lifecycle through Oracle Enterprise Manager Cloud Control, its new centralised console." 
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