<{p}>1.Which three are true about thresholds, metrics, and server-generated alerts? (Choose three.)<{br/}><{/p}>

【多选题】
A <{p}>All metrics are instance related.<{br/}><{/p}>
B <{p}>Cleared stateful alerts are displayed by querying DBA_ALERT_HISTORY.<{br/}><{/p}>
C <{p}>A space usage management alert is automatically cleared after the underlying problem is<{br/}>resolved.<{br/}><{/p}>
D <{p}>They are generated by SMON when a tablespace is 97% full.<{br/}><{/p}>
E <{p}>Metrics are statistical counts for a specific unit.<{br/}><{/p}>
F <{p}>STATISTICS_LEVEL must be set to ALL to generate alerts.<{br/}><{/p}>

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