This metric represents the number of sessions waiting at the sample time.
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 |
pre-10g |
Every Minute |
After Every Sample |
> |
Not Defined |
Not Defined |
3 |
%value% sessions are waiting. |
SELECT count(*) FROM v$session_wait WHERE wait_time = 0 and event not in IdleEvents
See Idle Events
When this count is high, the system is doing more waiting than anything else. Evaluate the various types of wait activity using the real-time and historical performance monitoring capabilities of Enterprise Manager.
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.