EM 12c監控雲資料庫告警：TNS-1189 - 1

郵件收到EM報警資訊如下，到資料庫檢視發現一切正常，資料庫可以正常登陸，監聽也沒有報錯的log , 業務也沒有反應異常。 

EM Event: Critical:LISTENER_szxcld204.hwc.com - TNS-1189. Please check log for details.

Host=szxcld204.hwc.com 
Target type=Listener 
Target name=LISTENER_szxcld204.hwc.com 
Message=TNS-1189. Please check log for details. 
Severity=Critical 
Event reported time=Nov 25, 2015 6:00:32 AM CST 
Operating System=Linux
Platform=x86_64 
Associated Incident Id=807 
Associated Incident Status=New 
Associated Incident Owner= 
Associated Incident Acknowledged By Owner=No 
Associated Incident Priority=None 
Associated Incident Escalation Level=0 
Event Type=Metric Alert 
Event name=TNS_ERRORS:tnserrmsg 
Total Occurrences=7 
Occurrences in this event=7 
First Occurred in this event=Nov 25, 2015 5:07:00 AM CST 
Last Occurred in this event=Nov 25, 2015 5:07:00 AM CST 
Metric Group=TNS Errors
Metric=TNSMsg
Metric value=TNS-1189(version) TNS-1189(status) TNS-1189(services)
Key Value=TNS-1189
Key Column 1=TNSError
Rule Name=DB_Cloud_Monitor_Rule_Set,DB_Cloud_Monitor_Alarm_Rule 
Rule Owner=SYSMAN 
Update Details:
TNS-1189. Please check log for details.
Incident created by rule (Name = Incident management rule set for all targets, Create incident for critical metric alerts [System generated rule]).