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The agent on your OMS server may report the following alert:

Host=myoemserver01.com
Target type=OMS and Repository
Target name=Management Services and Repository
Message=Average event dequeue time is %value% milliseconds, crossed warning (%warning_threshold%) or critical (%critical_threshold%) threshold. Dequeue time may get worse if queue table (EM_EVENT_BUS_TABLE) needs maintenance.
Severity=Warning
Event reported time=Jan 16, 2013 1:13:31 PM PST
Operating System=Linux
Platform=x86_64
Event Type=Metric Alert
Event name=EventStatus:event_bus_avg_dequeue_time_10min
Metric Group=Event Status
Metric=Average Event Dequeue Time (Milliseconds)
Metric value=112
Key Value=
Rule Name=TEST,Incident creation Rule for metric alerts.
Rule Owner=SYSMAN
Update Details: Average event dequeue time is %value% milliseconds, crossed warning (%warning_threshold%) or critical (%critical_threshold%) threshold. Dequeue time may get worse if queue table (EM_EVENT_BUS_TABLE) needs maintenance

In your log files you’ll find a reference to error BEA-37. This error, which first appeared in 11g Grid Control, can safely be ignored. However, it does show up as a Warning in your OMS console and the email notice makes it appear quite serious.

The BEA-37 is a genuine error on your Weblogic administrative server, but I’ve been assured by Oracle Support that it has no impact on Enterprise Manager.

You can edit the configuration of the EM agents on your OMS server to disable reporting on this error.
Shut off the emagent on your OMS server
Make a backup copy of . ..agent_inst/sysman/config/emd.properties
Add the two lines below to emd.properites (
Restart the agent
# EM agent should ignore BEA-337 warnings from Weblogic
adrAlertLogAsErrorCodeExcludeRegex=.*BEA-(337)\D.*

If the problems continue, you can adjust the metric threshold through the console.

From the Setup drop-down, select Manage Cloud Control | Health Overview
From the OMS and Repository drop-down over on the left side, now select All Metrics
Expand the Event Status group
Select Average Event Deque Time metric and you’ll see the history of these warnings and alerts
Press the Modify Thresholds button to adjust the values. See illustration belowImage