1. Which two are true about server-generated alerts（）?
   A、Stateless alerts can be cleared manually
   B、Stateless alerts are automatically cleared after one day.
   C、Stateful alerts are purged automatically from the alert history after one day
   D、Stateless alerts can be purged manually from the alert history.
   E、Stateful alerts must be cleared by a DBA to resolve the problem identified in the alert.

答案:AD
https://docs.oracle.com/cd/E11882_01/server.112/e25494/monitoring.htm#ADMIN11247

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