EM 12c监控云数据库告警：TNS-1189

邮件收到EM报警信息如下，到数据库查看发现一切正常，数据库可以正常登陆，监听也没有报错的log , 业务也没有反应异常。

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]).

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