ME ( Metric Extension ) Metric Is Not Collected For Some Databases

By default, ME metric will not be collected if associated target has a severity on response:state metric. So override this default by explicitly choosing Advanced option while creating ME.

For some databases, ME ( Metric Extension ) is not collecting data. But for the rest databases, it is working fine.


Checking the ME ( Metric Extension ) definition and found an advanced option is not selected.


After creating a new version of this ME ( Metric Extension ) by checking this mentioned option, it works fine.

The reason is  this database has frequent Warning/Critical response metric alert. like  :


Event Type=Metric Alert
Event name=Server_Adaptive_Threshold_Metric:instance_efficiency__response_time_pt
Metric Group=Server_Adaptive_Threshold_Metric
Metric=Response Time Per Txn
Metric value=258.497253691275
Key Value=SYSTEM
Rule Owner=
Update Details:
Metrics “Response Time Per Txn” is at 258.497
Incident created by rule (Name = Incident management rule set for all targets, Create incident for critical metric alerts [System generated rule]).

Create a Metric Extension (ME) to Monitor FRA Usage on OEM

OEM Metric Extension (ME) is a great feature for developing customized metrics, which are unavailable by default.

As we know “Archive Area % Used” metric does not work for using FRA as archive destination when the destination is set to USE_DB_RECOVERY_FILE_DEST. We only receive after “Recovery Area % Used” metric triggers when it hits a Warning threshold of 85% full, and Critical of 97% full.

But the fixed thresholds of 85( Warning )/97( Critical) is not good enough for handling FRA full. So we developed a customized more flexible way to  monitor and alert when FRA is used as archive destination.

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So, the Metric Extension ( ME) is created successfully, in another post, we will create a Incident Rule which will create an incident and notification for all the over threshold Warning and Critical alerts.

Create an Incident Rule for Metric Extension ( ME ) to Monitor FRA Used in OEM

Further more, we will create a Corrective Action ( CA ) against this Metric Extension ( ME ) to start a archive log backup automatically.

Use Corrective Action ( CA ) to Automate Archivelog Backup When FRA Usage is Over Threshold of Metric Extension ( ME ) in OEM