12 Oracle Application Server Metrics

Oracle Enterprise Manager gathers performance metrics that provide high-level information about the status, performance, and availability of your Oracle Application Server.

Application Response Metrics

This category of metrics uses the Application URL to measure the responsiveness and availability of the application server instance

Default Collection Interval — Every 5 minutes

Table 12-1 Application Response Metrics

Metric	Description
Application URL Response Time (seconds)	The Application URL Response Time is measured by automatically and continuously attempting to access the Application URL. The response time includes the time it takes to access the URL and for the application server to render and display the Application URL content. Note that this metric is used primarily by Grid Control to measure the responsiveness of the application server instance. The Application URL is shown in the General section of the Application Server Home page in the Grid Control Console, and it is used to generate the Application URL Response chart on that page. By the default, the Application URL consists of the application server host name and default listener port for Oracle HTTP Server component. For example: http://hostname.domain:7778 If you are using the Grid Control Console, you can modify the Application URL by modifying the properties of the Application Server target. For more information, see Modifying Target Properties in the Grid Control online help. Alternatively, you can change the Application URL by clicking Change Application URL on the Application Server Home page in the Grid Control Console.
Application URL Status	This metric indicates whether or not the Application URL, which is used to define the responsiveness of the Application Server, can be accessed successfully. For example, if the Application URL returns an error, the Application URL Status metric will be down. Note that this metric is used primarily by Grid Control to measure the responsiveness of the application server instance. The Application URL is shown in the General section of the Application Server Home page in the Grid Control Console, and it is used to generate the Application URL Response chart on that page. A value of one (1) indicates that Oracle Management Agent can access the Application URL; a value of zero (0) indicates that the Application URL cannot be accessed successfully.For more information, see Application URL Response Time (seconds).

Metric

Description

Application URL Response Time (seconds)

The Application URL Response Time is measured by automatically and continuously attempting to access the Application URL. The response time includes the time it takes to access the URL and for the application server to render and display the Application URL content.

Note that this metric is used primarily by Grid Control to measure the responsiveness of the application server instance. The Application URL is shown in the General section of the Application Server Home page in the Grid Control Console, and it is used to generate the Application URL Response chart on that page.

By the default, the Application URL consists of the application server host name and default listener port for Oracle HTTP Server component. For example:

http://hostname.domain:7778

If you are using the Grid Control Console, you can modify the Application URL by modifying the properties of the Application Server target. For more information, see Modifying Target Properties in the Grid Control online help. Alternatively, you can change the Application URL by clicking Change Application URL on the Application Server Home page in the Grid Control Console.

Application URL Status

This metric indicates whether or not the Application URL, which is used to define the responsiveness of the Application Server, can be accessed successfully. For example, if the Application URL returns an error, the Application URL Status metric will be down. Note that this metric is used primarily by Grid Control to measure the responsiveness of the application server instance. The Application URL is shown in the General section of the Application Server Home page in the Grid Control Console, and it is used to generate the Application URL Response chart on that page. A value of one (1) indicates that Oracle Management Agent can access the Application URL; a value of zero (0) indicates that the Application URL cannot be accessed successfully.For more information, see Application URL Response Time (seconds).

OPMN Process Information Metrics

The OPMN Process Information Metrics provide you with a snapshot of how the primary components of your application server--as well as specific components of Oracle Enterprise Manager--are performing. The list provided here will vary, depending upon the application server components you have installed and configured for this instance of Oracle Application Server. Enterprise Manager components that you can monitor by reviewing the OPMN Process Information Metrics include Oracle Management Agent (agent), Oracle Application Server Control process (console), and Oracle Management Agent watchdog process (watchdog). For more information about the Management Agent watchdog process, see Oracle Enterprise Manager Advanced Configuration.

Default Collection Interval — Every 5 minutes

Table 12-2 OPMN Process Information Metrics

Metric	Description
Component CPU Usage (%)	Shows the percentage of host CPU used by the selected application server component.
Component Memory Usage (%)	Shows the percentage of host memory used by the selected application server component.
Component Memory Usage (MB)	Shows the memory usage in megabytes for the selected component.
Component Start Time (ms since epoch)	This metric is for internal use only.
Component Up Time (ms)	This metric is for internal use only.
Component Up/down Status	Shows whether the component is up or down. A value of one (1) indicates that the component is up and running; a value of zero (0) indicates that the component is down. If you are using Grid Control, see About Availability in the online help for more information about how Enterprise Manager determines the availability of Oracle Application Server or Enterprise Manager component.
Free Memory (%)	Shows you the percentage of memory that is free on the application server host. The amount of free memory available can help you determine whether or not the system is ready to handle a heavier load.
Free Memory (MB)	Shows you the amount of memory (in megabytes) that are free on the application server host. The amount of free memory available can help you determine whether or not the system is ready to handle a heavier load.
Idle CPU Time (%)	Shows the percentage of time that the CPU was idle and the system did not have an outstanding disk I/O request.
Total Memory (MB)	Shows you the total physical memory available on the application server host computer.

Resource Usage Metrics

This category of metrics provides you with information about the CPU and Memory being used by the application server.

Default Collection Interval — Every 5 minutes

Table 12-3 Resource Usage Metrics

Metric	Description
CPU Idle Time (%)	shows the percentage of system CPU time that is idle. The amount of idle CPU time can help you determine whether or not the system is ready to handle a heavier load.
CPU Usage (%)	Shows the percentage of the host CPU being used by the application server and all its configured and enabled components.
Free Memory (%)	Shows you the percentage of memory that is free on the application server host. The amount of free memory available can help you determine whether or not the system is ready to handle a heavier load.
Free Memory (MB)	Shows you the amount of memory (in megabytes) that are free on the application server host. The amount of free memory available can help you determine whether or not the system is ready to handle a heavier load.
Memory Usage (%)	Shows you the percentage of host memory being used by the application server and its configured and enabled components.
Memory Usage (MB)	Shows you the amount of memory (in megabytes) being used by the application server and its configured and enabled components.
Other CPU Usage (%)	Shows the amount of CPU owned and used by host processes, other than the application server and its configured and enabled components. If you are having problems with CPU usage on the application server host computer, this metric can help you determine whether or not the application server is causing the problem.
Other Memory Usage (%)	Shows the percentage of host memory in use by other processes or applications, other than the application server and its configured and enabled components. If you are having problems with memory usage on the application server host computer, this metric can help you determine whether or not the application server is causing the problem.
Other Memory Usage (MB)	Shows the amount of memory (in megabytes) currently in use by other processes or applications, other than the application server and its configured and enabled components. If you are having problems with memory usage on the application server host computer, this metric can help you determine whether or not the application server is causing the problem.
Total Memory (MB)	Shows you the total physical memory available on the application server host computer.

Response Metrics

This category contains the UpDown Status metric, which indicates whether the Application Server is up or down.

Default Collection Interval — Every 5 minutes

Table 12-4 Response Metrics

Metric	Description
UpDown Status	Shows whether or not all the enabled Application Server components are up and running. For example, if one OC4J instance is down, the UpDown Status will be down even if the other application server components are up and running. The status of the Application Server appears in the General section of the Application Server home page in the Grid Control Console.