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Oracle Enterprise Manager

Oracle Enterprise Manager (OEM) is a set of systems management tools provided by Oracle Corporation for managing the Oracle environment. It provides tools to monitor the Oracle environment and automate tasks (both one-time and repetitive in nature) to take database and application administration a step closer to "Lights Out" management.

Web Based Oracle Enterprise Manager

Database control

Oracle Enterprise Manager application for managing a single Oracle Database.

Database Control was first introduced with Oracle 10g and is installed with the database software.

Grid control

Oracle Enterprise Manager's web based interface for centrally managing all your Oracle environments from a single point.

EM Agents

Agents can be installed on servers to collect data to feed into Grid control. To manage the agent:

CMD>set ORACLE_SID=sid
CMD>emctl stop agent
CMD>emctl start agent
CMD>emctl status agent

GUI Based Enterprise Manager

Shipped with the Oracle "client CD". Select a "Administrator" type install.

Some options, like the Replication Manager is only available with the GUI version.

Management packs

The following management packs are available. These packs must be separately licensed. Also note that these packs are only available for Oracle Enterprise Edition (EE). So, if you are running Standard Edition (SE), and you want to use one of these packs, you will have to licence and upgrade to EE first (strange, but true!).

Oracle Configuration Management Pack

Track hardware and software configuration for hosts and databases plus cloning for database instances and Oracle home to facilitate deployments.

Oracle Change Management Pack

Evaluate, plan for, and implement database schema changes to support new application requirements; eliminate errors/data loss when making changes; minimize downtime.

Oracle Diagnostics Pack

Ensure high availability of mission-critical business systems by reducing the number of complex performance tasks.

Oracle Tuning Pack (requires Diagnostics Pack)

Dynamic tuning recommendations for more-efficient resource utilization, higher transaction throughput, faster query performance; avoid costly hardware, memory, and disk upgrades.

Implementation

OEM creates a SYSMAN schema in the Oracle database to store metadata and statistics. SYSMAN also acts as the super-administrator account for first-time login. The default password for SYSMAN is oem_temp.

To create a new DBControl repository:

emca -config dbcontrol db -repos create

To start a DB Console:

emctl start dbconsole