9.7.
Oracle Enterprise
Manager (OEM) is a tool supplied by Oracle that provides an
easy-to-use, graphical approach to managing one or more databases. It
combines a number of distinct facilities into an integrated platform
for managing Oracle products. From the Oracle Enterprise
Manager's console, the DBA may be able to:
-
Administer, diagnose, and tune one or more databases
-
Distribute software to multiple servers and clients
-
Schedule jobs on multiple nodes at varying times
-
Monitor objects and events throughout the Oracle network
-
Customize the display using graphic maps and groups of network
objects such as nodes and databases
-
Administer Oracle parallel servers
-
Integrate participating Oracle or third-party tools
 |
Although Oracle Enterprise Manager is shipped with the Oracle
database product, some features of the Enterprise Manager (for
example, the Performance Pack) are separately licensed and may only
be used with an appropriate license.
|
|
The client/server architecture of Oracle Enterprise Manager consists
of a centralized console, common services, and intelligent agents
running on the managed nodes. Various applications reside on top of
the common services, performing system management tasks.
The Oracle Enterprise Manager Console is a graphical user interface
that provides menus, toolbars, launch palettes, and the framework to
allow access to Oracle tools, plus utilities available through other
vendors. The windows provide access to several components:
Navigator
-
Discovers and displays a tree list of all the objects in a network,
such as user-defined groups, nodes, listeners, name servers, and
databases, plus the objects they contain.
Map
-
Provides a means to create, save, modify, and recall views of the
network. Objects can be dragged and dropped from the Navigator into
the Map view to create groups to be monitored.
Console menu bar
-
Provides access to the Navigator, Map, Job, Event, and database
administration applications.
Oracle Enterprise Manager has a set of common services that help
manage nodes throughout the Oracle network. Key to these services is
the repository. The Oracle Enterprise Manager repository
is a set of tables in an Oracle database. Each administrator is
associated with a specific repository in a database, and any
information related to the tasks performed by the administrator is
stored in that repository. The repository provides a centralized
location for storing information on configurations, jobs and events,
historical collections, tuning recommendations, the preferred
credentials for each user, and other information associated with the
DBA user. The repository tables can be installed in any database
accessible in the Oracle network, and a DBA can log on to the
repository database from any machine.
The Job Scheduling System allows the
management of job scheduling among the databases, listeners, and
nodes being administered. Jobs can be scheduled and run on remote
sites throughout the network at various times, such as daily or
weekly, and at single or multiple destinations.
The Event Management System allows tracking
and display of the status of events occurring on the databases,
listeners, and nodes in the Oracle network. A job can be specified
that will take corrective action when a particular event is detected.
Oracle Enterprise Manager uses intelligent agents and a communication
daemon to manage Console tasks such as scheduling and running remote
jobs and monitoring events on remote sites. The intelligent agent is
a process that runs on remote nodes in the network and functions as
the executor of jobs and events sent by the Console via the
communication daemon. The agent can function regardless of the status
of the Console or network connections.
Access to Oracle services on the network is controlled by a set of
user-defined, preferred credentials for the available nodes and
services. Oracle Enterprise Manager encrypts the user authentication
information in the repository and provides it as part of the
connection request from the Console or Console-launched applications.
Oracle Enterprise Manager includes a set of standard integrated
database administration applications. These applications are
specialized management tools that can be launched directly from the
Console or the Administration toolbar. Third parties can write
applications that integrate into the Console and use the available
common services, and these applications can be launched directly from
the Console.
A command-line interface is sometimes necessary or desirable, so
Oracle Server Manager provides a conversational line mode. In line
mode, DBA commands can be explicitly executed on a command
line.
|
