This metric shows the average age of all the messages in the queue per subscriber for all non-system queues in seconds.
The rest of the information in this section is only valid for this metric when it appears in either the Enterprise Manager Grid Control or the Enterprise Manager Database 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 |
|
11.2.0.x |
Every 30 Minutes |
After Every Sample |
>= |
Not Defined |
Not Defined |
1 |
Average age of messages for the subscriber %subs_name% %subs_address% in %schema%.%queue_name% queue is %value% seconds. |
For this metric you can set different warning and critical threshold values for each unique combination of "Schema Name", "Queue Name", "Subscriber Name", and "Subscriber Address" objects.
If warning or critical threshold values are currently set for any unique combination of "Schema Name", "Queue Name", "Subscriber Name", and "Subscriber Address" objects, those thresholds can be viewed on the Metric Detail page for this metric.
To specify or change warning or critical threshold values for each unique combination of "Schema Name", "Queue Name", "Subscriber Name", and "Subscriber Address" objects, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.
Average is calculated using SYSDATE and ENQ_TIME, CONSUMER_NAME columns from the following view: <SCHEMA>.AQ$<QUEUE_TABLE_NAME>.
This is a dynamic view that gets created by default by the Oracle database when the user creates a queue table and queue.
When using queues for storing and propagating messages, monitor this metric to get the average age of messages in the queue per subscriber.
Related Topics
About Alerts
About the Metric Detail Page
Editing Thresholds
Understanding Line Charts
Copyright © 1996, 2009, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
Other names may be trademarks of their respective owners.