Which three are true about thresholds, metrics, and server-generated alerts? (Choose three.)

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Which three are true about thresholds, metrics, and server-generated alerts? (Choose three.)

A.All metrics are instance related.
B.Cleared stateful alerts are displayed by querying DBA_ALERT_HISTORY.
C.A  space  usage  management  alert  is automatically  cleared  after the  underlying  problem  is resolved.
D.They are generated by SMON when a tablespace is 97% full.
E.Metrics are statistical counts for a specific unit.
F.STATISTICS_LEVEL must be set to ALL to generate alerts.
正确答案BCE
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