单选题View the Exhibit to examine the output of the DBA_OUTSTANDING_ALERTS view. After 30 minutes， you executed the following command： SQL SELECT reason，metric_value FROM dba_outstanding_alerts； REASON METRIC_VALUE ------------------------------------------------------------ ------------ Tablespace [TEST] is [28 percent]full 28.125 What could be the reason for the elimination of the other rows in the output（）AAn Automatic Workload Repository snapshot has been taken recently.BThe non-threshold-based alerts are transferred to DBA_ALERT_HISTORY.CThe threshold alerts conditions are cleared and the alerts are transferred to DBA_ALERT_HISTORY.DThe threshold alerts related to database metrics are permanently stored in DBA_ALERT_HISTORY but not the threshold alerts related to instance metrics.
单选题
View the Exhibit to examine the output of the DBA_OUTSTANDING_ALERTS view. After 30 minutes， you executed the following command： SQL> SELECT reason，metric_value FROM dba_outstanding_alerts； REASON METRIC_VALUE ------------------------------------------------------------ ------------ Tablespace [TEST] is [28 percent]full 28.125 What could be the reason for the elimination of the other rows in the output（）
A
An Automatic Workload Repository snapshot has been taken recently.
B
The non-threshold-based alerts are transferred to DBA_ALERT_HISTORY.
C
The threshold alerts conditions are cleared and the alerts are transferred to DBA_ALERT_HISTORY.
D
The threshold alerts related to database metrics are permanently stored in DBA_ALERT_HISTORY but not the threshold alerts related to instance metrics.
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