This chapter describes Oracle HTTP Server (OHS) metrics.
Provides metrics about Oracle HTTP Server processes.
The amount of heap space (total program memory) used by Apache's parent process.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | Not Defined | Not Defined | 2 | Heap Usage is %value%MB |
Provides general Oracle OracleHTTP Server metrics.
This metric shows the start time of Oracle HTTP Server.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
Contains metrics about Oracle HTTP Server modules.
This metric specifies the number of requests currently being handled by this module.
This metric specifies the average time (in seconds) it took the module to handle a request during the last interval. The interval is the period of time specified as the collection frequency of this module.
This rate metric specifies the number of requests handled per second by this module during the last interval. The interval is the period of time specified as the collection frequency for this metric. This metric helps you determine the frequency of requests currently being served by the module. If the request handling throughput is very low, either there is no activity on the Web server for the module, or there is something else going on that is preventing the module from processing requests.
Includes metrics about the amount of Oracle HTTP Server response codes since the Oracle HTTP Server was last restarted.
The number of HTTP 4xx errors generated since the Oracle HTTP Server was last restarted.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 15 Minutes |
This metric specifies the number of HTTP 5xx errors generated since the Oracle HTTP Server was last restarted.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 15 Minutes |
Displays information about Oracle HTTP Server.
This metric specifies the number of child servers that are busy.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
This metric shows the percentage of Oracle HTTP Server child processes that are currently servicing requests.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | 85 | 90 | 2 | The percentage of processes that are busy handling requests is %value%%% |
To tune the percentage of Oracle HTTP Server child processes that are currently servicing requests, you can change the values for the MaxClients, MinSpareServers, and MaxSpareServers directives. You can change the values of the MaxClients, MinSpareServers and MaxSpareServers directives on the Oracle HTTP Server Performance Directives Configuration page in the Fusion Middleware Console. For more information about the MaxClients, MinSpareServers, and MaxSpareServers directives, go to the Apache HTTP Server Documentation section of the http://www.apache.org Web site, then navigate to the Directives information.
This metric shows the number of open HTTP connections.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| All Versions | Every 5 Minutes | After Every 12 Samples | > | 135 | 140 | 2 | The number of active connections is %value% |
This metric shows the average time (in seconds) a connection was open during the last interval. The interval is the period of time specified as the collection frequency for this metric. A connection remains open until all of the requests that it is handling have been completed.
This metric specifies the percentage of requests that encountered errors during the last interval. The interval is the period of time specified as the collection frequency for this metric.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | 1 | 1.5 | 2 | The percentage of requests that resulted in errors is %value%%% |
Use the Fusion Middleware Control Console to examine the errors in this Oracle HTTP Server's error log file. For information about viewing Oracle HTTP Server error logs in the Fusion Middleware Control, see the "Viewing Oracle HTTP Server Logs" topic in the Fusion Middleware Administrator's Guide.
This metric specifies the number of child servers that are available.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
This metric specifies the number of requests currently being serviced.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| All Versions | Every 5 Minutes | After Every 12 Samples | > | 135 | 140 | 2 | The number of active requests is %value% |
This metric shows the average time it took to process a request during the last interval. The interval is the period of time specified as the collection frequency for this metric.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| All Versions | Every 5 Minutes | After Every 12 Samples | > | Not Defined | Not Defined | 2 | The average processing time for a request is %value% seconds |
This metric shows the average time (in milliseconds) it took to process a request during the last interval. The interval is the period of time specified as the collection frequency for this metric.
This rate metric specifies the number of requests per second serviced during the last interval. The interval is the period of time specified as the collection frequency for this metric. This metric specifies how much of a load this Oracle HTTP Server is handling.
This metric specifies the average size of a response (in KB) during the last interval. The interval is the period of time specified as the collection frequency for this metric.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | Not Defined | Not Defined | 2 | The average size of a request is %value%KB |
This metric specifies the amount of response data (in KB/seconds) processed by Oracle HTTP Server during the last interval. The interval is the period of time specified as the collection frequency for this metric.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
Provides virtual host information.
This metric specifies the total number of active requests currently being processed by the virtual host.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | 135 | 140 | 2 | The number of active requests for virtual host %name% is %value% |
For this metric you can set different warning and critical threshold values for each "Name" object.
If warning or critical threshold values are currently set for any "Name" object, those thresholds can be viewed on the Metric Detail page for this metric.
To specify or change warning or critical threshold values for each "Name" object, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.
This metric shows the average amount of time it took the virtual host to process one request during the last interval. The interval is the period of time specified as the collection frequency for this metric.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | Not Defined | Not Defined | 2 | The average processing time for a request for virtual host %name% is %value% seconds |
For this metric you can set different warning and critical threshold values for each "Name" object.
If warning or critical threshold values are currently set for any "Name" object, those thresholds can be viewed on the Metric Detail page for this metric.
To specify or change warning or critical threshold values for each "Name" object, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.
This rate metric specifies the number of requests per second serviced by the virtual host during the last interval. The interval is the period of time specified as the collection frequency for this metric. This metric specifies how much of a load this virtual host is handling.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
This metric specifies the average size of a response (in KB) during the last interval. The interval is the period of time specified as the collection frequency for this metric.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | Not Defined | Not Defined | 2 | The average size of a request for virtual host %name% is %value%KB |
For this metric you can set different warning and critical threshold values for each "Name" object.
If warning or critical threshold values are currently set for any "Name" object, those thresholds can be viewed on the Metric Detail page for this metric.
To specify or change warning or critical threshold values for each "Name" object, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.
This metric specifies the amount of response data (in KB/second) processed by the virtual host during the last interval. The interval is the period of time specified as the collection frequency for this metric.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
Provides information about CPU and memory usage.
Shows the percentage of CPU used by the Oracle HTTP server.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | Not Defined | Not Defined | 2 | CPU Utilization is %value%%% |
Shows the percentage of time the CPU has been idle on the host.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
Shows the percentage of CPU used by host processes other than Oracle HTTP Server. If you are having problems with CPU usage on the Oracle HTTP server host computer, this metric can help you determine whether or not Oracle HTTP server is causing the problem.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
This metric shows the current physical memory used by Oracle HTTP Server.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
This metric shows current free memory on the host that has Oracle HTTP Server.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
This metric shows current host memory used by processes other than Oracle HTTP Server. If you are having problems with CPU usage on the Oracle HTTP Server host computer, this metric can help you determine whether or not Oracle HTTP Server is causing this problem.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
Amount of physical memory (in MB) for the host where Oracle HTTP Server is running.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
Shows the current percentage of physical memory used by the component.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes | After Every 12 Samples | > | 80 | 90 | 2 | Memory Utilization is %value%%% |
This metric shows the percentage of current free memory on the host that has Oracle HTTP Server.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
This metric specifies the percentage of other memory usage on the computer. It includes all the memory except for Oracle HTTP Server.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected.
| Target Version | Collection Frequency |
|---|---|
| 9.0.2.x and 9.0.3.x; 9.0.4.x and 10.1.2.x | Every 5 Minutes |
Contains metrics that give availability information about Oracle HTTP Server.
This metric indicates whether or not Oracle HTTP Server is up or down. A status of 1 means the server is up, and a status of 2 means the server is down.
The rest of the information in this section is only valid for this metric when it appears in Enterprise Manager Grid Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
| Target Version | Evaluation and Collection Frequency | Upload Frequency | Operator | Default Warning Threshold | Default Critical Threshold | Consecutive Number of Occurrences Preceding Notification | Alert Text |
|---|---|---|---|---|---|---|---|
| All Versions | Every Minute | After Every 60 Samples | = | Not Defined | 0 | 1 | The Oracle HTTP Server instance is down |