This metric signifies that the database being monitored has generated a media failure error (ORA-01242 or ORA-01243) to the alert file since the last sample time. The alert file is a special trace file containing a chronological log of messages and errors. An alert event is triggered when data block corrupted messages are written to the alert file.
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 |
11.1.0.x; 11.2.0.x |
Every 5 Minutes |
After Every Sample |
MATCH |
Not Defined |
.* |
1* |
Media failure detected in %alertLogName% at time/line number: %timeLine%. |
* Once an alert is triggered for this metric, it must be manually cleared.
For this metric you can set different warning and critical threshold values for each "Time/Line Number" object.
If warning or critical threshold values are currently set for any "Time/Line Number" object, those thresholds can be viewed on the Metric Detail page for this metric.
To specify or change warning or critical threshold values for each "Time/Line Number" object, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.
$ORACLE_HOME/sysman/admin/scripts/alertlogAdr.pl where $ORACLE_HOME refers to the home of the Oracle Management Agent.
Use Support Workbench in Enterprise Manager to examine the details of the error. Note: This event does not automatically clear since there is no automatic way of determining when the problem has been resolved. Hence, you need to manually clear the event once the problem is fixed.
Related Topics
About Alerts
About the Metric Detail Page
Editing Thresholds
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