Age of the first message in persistent queue per queue (seconds)

Description

This metric gives the age (in seconds) of the first message in the persistent queue for all non-system queues in the database.

Metric Summary

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

Age of first message in %schema%.%queue_name% queue is %value% seconds.

Multiple Thresholds

For this metric you can set different warning and critical threshold values for each unique combination of "Schema Name" and "Queue Name" objects.

If warning or critical threshold values are currently set for any unique combination of "Schema Name" and "Queue Name" 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" and "Queue Name" objects, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.

Data Source

This metric is calculated by finding the age of the first message in all the subscribers of the queue and then the oldest amongst all is taken.

The following views/tables are used for the calculation:

  1. <SCHEMA>.AQ$_<QUEUE_TABLE>_S

  2. <SCHEMA>.AQ$_<QUEUE_TABLE>_I

  3. <SCHEMA>.AQ$<QUEUE_TABLE>

User Action

When using persistent queues for storing and propagating messages, monitor this metric to get the age of first message in the queue.

Related Topics

About Alerts

About the Metric Detail Page

Editing Thresholds

Understanding Line Charts

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