50.Which two statements are true about alerts? (Choose two.)

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本文介绍了Oracle数据库中的告警系统，主要包括Server-Generated Alerts的工作原理及其管理方式。文章详细解释了两种类型的告警，以及如何通过数据库视图来查看当前未解决的告警和历史告警记录。

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50.Which two statements are true about alerts? (Choose two.)
A.Clearing an alert sends the alert to the alert history.
B.Response actions cannot be specified with server-generated alerts.
C.The nonthreshold alerts appear in the DBA_OUTSTANDING_ALERTS view.
D.Server-generated alerts notify the problems that cannot be resolved automatically and require administrators to be notified.
答案：AD
解析：
参考：http://docs.oracle.com/cd/E11882_01/server.112/e25494/monitoring.htm#ADMIN11247
告警有两种，一种是trace和alert文件，一种是Server-Generated Alerts
这道题应该说的是第二种情况
Server-Generated Alerts是数据库产生的一种告警，它可能包括解决这个告警的方法，当告警清除后还会生成通知消息
当问题出现或者没有匹配到期望的阈值的时候就会自动生成告警，这些阈值都是可以定义的，比如
1.每秒的物理读
2.每秒的用户提交
3.sql服务响应时间
一些没有基于阈值的比如
1.快照太旧
2.恢复会话挂起
3.恢复区的使用
A：正确，当告警清除后会从DBA_OUTSTANDING_ALERTS删除，并且在DBA_ALERT_HISTORY中添加
B：错误，参考第一种情况的第三条
C：正确
D：正确
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