单项选择题

ViewtheExhibittoexaminetheoutputoftheDBA_OUTSTANDING_ALERTSview.After30minutes，youexecutedthefollowingcommand：SQL>SELECTreason，metric_valueFROMdba_outstanding_alerts；REASONMETRIC_VALUE------------------------------------------------------------------------Tablespace[TEST]is[28percent]full28.125Whatcouldbethereasonfortheeliminationoftheotherrowsintheoutput（）
A.AnAutomaticWorkloadRepositorysnapshothasbeentakenrecently.
B.Thenon-threshold-basedalertsaretransferredtoDBA_ALERT_HISTORY.
C.ThethresholdalertsconditionsareclearedandthealertsaretransferredtoDBA_ALERT_HISTORY.
D.ThethresholdalertsrelatedtodatabasemetricsarepermanentlystoredinDBA_ALERT_HISTORYbutnotthethresholdalertsrelatedtoinstancemetrics.

A.After30minutes，youexecutedthefollowingcommand：SQL>SELECTreason，metric_valueFROMdba_outstanding_alerts；REASONMETRIC_VALUE------------------------------------------------------------------------Tablespace[TEST]is[28percent]full28.125Whatcouldbethereasonfortheeliminationoftheotherrowsintheoutput（）
A.AnAutomaticWorkloadRepositorysnapshothasbeentakenrecently.
B.Thenon-threshold-basedalertsaretransferredtoDBA_ALERT_HISTORY.
C.ThethresholdalertsconditionsareclearedandthealertsaretransferredtoDBA_ALERT_HISTORY.
D.ThethresholdalertsrelatedtodatabasemetricsarepermanentlystoredinDBA_ALERT_HISTORYbutnotthethresholdalertsrelatedtoinstancemetrics.

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