Databases Reference
In-Depth Information
Figure 5-1. Typical Cloud Control home page
Other key Enterprise Manager components in its architecture include the following:
Oracle Management Agents
Deployed on each host/database instance to be monitored, the agents automatically
discover all Oracle components. The agents track each target's health, status, and
performance and also relevant hardware and software configuration data and store
the data locally in XML files prior to uploading the XML files. Management
Agents can also perform predefined jobs and can be used to send Simple Network
Management Protocol (SNMP) traps to database performance monitors required
by other system monitoring tools. Management Agents are available for the wide
variety of operating systems on which the Oracle Database is available.
Oracle Management Service (OMS)
The OMS is a middle-tier web application (requiring the WebLogic Server) that,
working with Oracle Management Agents, discovers targets, monitors and manages
the targets, and stores the information it collects in the Oracle Management Repos‐
itory by synchronously uploading XML files generated by the agents. OMS also
renders the Cloud Control console user interface. To avoid EM outages, Oracle
recommends deployment of multiple OMSs with a server load balancer.
Oracle Management Repository
The Management Repository is configured in an Oracle Database and stores per‐
formance and availability data and configuration and compliance data uploaded by
the OMS from Management Agents on the managed targets. Once in the repository,
the data can be accessed by designated administrators through Enterprise Manager
Cloud Control. The Management Repository also stores EM configuration infor‐
mation including users and privileges, monitoring settings, and job definitions.
Where OMS outages are to be avoided, Oracle recommends deployment of the
Management Repository in a RAC configuration.
