Oracle® Enterprise Manager Concepts
10g Release 2 (10.2)
This chapter introduces the concept of group management and contains the following sections:
Today's IT operations can be responsible for managing a great number of components, such as databases, application servers, hosts, or other components, which can be time consuming and impossible to manage individually. The Enterprise Manager Grid Control group management system lets you combine components (called targets in Enterprise Manager) into logical sets, called groups. This enables you to organize, manage, and effectively monitor the potentially large number of targets in your enterprise.
Enterprise Manager Groups can include:
Targets of the same type, such as:
All hosts in your data center
All of your production databases
Targets of different types, such as:
The database, application server, listener, and host that are used in your application environment
Targets operating within a particular data center region
Note:An Enterprise Manager "System," used specifically to group the components on which a service runs, is a special kind of Enterprise Manager group. Many of the functions and capabilities for groups and systems are similar. See Chapter 11, "Service Management" for a detailed explanation of systems and how they are used.
View a summary status of the targets within the group.
Monitor outstanding alerts and policy violations for the group collectively, rather than individually.
Monitor the overall performance of the group through performance charts.
Perform administrative tasks, such as scheduling jobs for the entire group, or blacking out the group for maintenance periods.
You can also customize the console to provide direct access to group management pages.
Availability pie chart that provides at-a-glance information on the current status across all members so you can easily assess the percentage of members that are up, and the percentage of members that are unavailable. You can quickly drill down for information if any member target is down.
Roll-up of open alerts and policy violations, categorized by severity, so you can quickly focus on the most critical problems first. Alerts and violations that have occurred within the last 24 hours highlight problems that recently occurred.
Access to the Policy Trend Overview page, which provides a comprehensive view of the group for compliance with policy rules over a period of time. Using policy charts, you can assess trends such as increased or decreased number of policy violations, changes in the overall group compliance score, and the percentage of members in compliance with your enterprise's policy rules.
Access to the Security at a Glance page, which provides an overview of the security health of the group. This shows statistics about security policy violations and critical security patches that have not been applied.
Summary of recent configuration changes across all members in the group, so you can easily determine if a new problem is related to any recent changes.
Summary of Critical Patch Advisories for Oracle homes within the group.
See Also:"Group Home Page" in the Enterprise Manager online help
The Group Charts page, shown in Figure 5–3, enables you to monitor the collective performance of the group. Out-of-box performance charts are provided based on the type of members in the group. For example, when databases are part of the group, a Wait Time (%) chart is provided that shows the top databases with the highest wait time percentage values. You can view this performance information over the last 24 hours, last 7 days, or last 31 days. You can also add your own custom charts to the page.
See Also:"Group Charts Page" in the Enterprise Manager online help
Run jobs or find out the status of currently running jobs against the group.
Define planned outage windows, called blackouts, on the members of the group to perform maintenance tasks.
Run SQL commands collectively against the database member targets of the group.
View the most recent backup for each database in the group.
View the last 100,000 bytes of the alert log for all databases in the group.
Use a deployment summary to easily obtain hardware and software inventory information across all member targets.
See Also:"Group Administration Page" in the Enterprise Manager online help
The Group Members page, shown in Figure 5–5, summarizes information about the member targets in the group. It includes information on their current availability status, roll-up of open alerts and policy violations, and key performance metrics based on the type of targets in the group.
You can visually assess availability and relative performance across all member targets. You can sort on any of the columns to rank members by a certain criterion (for example, database targets in order of decreasing wait time percentage). Default key performance metrics are displayed based on the targets you select, but you can customize these to include additional metrics that are important for managing your group.
See Also:"Group Members Page" in the Enterprise Manager online help
The System Dashboard, shown in Figure 5–6, enables you to proactively monitor the status and alerts in the group as they occur. The color-coded interface is designed to highlight problem areas using the universal colors of alarm—targets that are down are highlighted in red, metrics in critical severity are shown as red dots, metrics in warning severity are shown as yellow dots, and metrics operating within normal boundary conditions are shown as green dots.
Using these colors, you can easily spot the problem areas for any target and drill down for details as needed. An alert table is also included to provide a summary for all open alerts in the group. The alerts in the table are presented in reverse chronological order to show the most recent alerts first, but you can also click on any column in the table to change the sort order.You can customize the dashboard according to your needs. You can specify which key metrics should be included in the dashboard and the display names to be used for these metrics. You can also customize the refresh interval to ensure that you always receive timely information about alerts as they are detected.You can launch the System Dashboard in context from any Group Home page. However, using reporting framework features, you can also make the System Dashboard publicly available for any user that has access to a web browser and the Enterprise Manager Reports Web site.
Enterprise Manager provides several out-of-box reports for groups as part of the reporting framework, called Information Publisher. These reports display important administrative information, such as hardware and operating system summaries across all hosts within a group, and monitoring information, such as outstanding alerts and policy violations for a group.
You can access these reports from the Reports link in the Related Links section of all Group pages. Figure 5–7 shows the Availability History report for a specified group over the last 31 days.
See Also:Chapter 7, "Information Publisher"
A redundancy group is a group that contains members of the same type that function collectively as a unit. A type of redundancy group functions like a single logical target that supports a status (availability) metric. A redundancy group is considered up (available) if at least one of the member targets is up.
You can create and administer a redundancy group from the All Targets page. Redundancy groups support all group management features previously discussed.
Do not use redundancy groups if the group you want to model is a Real Application Clusters database, host cluster, HTTP server high availability group, or OC4J high availability group. Instead, you can use the following specialized target types for this purpose:
HTTP HA Group
OC4J HA Group