单选题You have specified the warning and critical threshold values of an application tablespace to be 60% and 70%， respectively. From the tablespace space usage metrics， you find that the actual space usage has reached the specified warning threshold value， but no alerts have been generated. What could be the reason for this？（）AThe EVENT parameter was not set.BThe SQL_TRACE parameter is set to FALSECThe Enterprise Manager Grid Control is not used.DThe STATISTICS_LEVEL parameter is set to BASICEThe TIMED_STATISTICS parameter is set to FALSE
单选题
You have specified the warning and critical threshold values of an application tablespace to be 60% and 70%， respectively. From the tablespace space usage metrics， you find that the actual space usage has reached the specified warning threshold value， but no alerts have been generated. What could be the reason for this？（）
A
The EVENT parameter was not set.
B
The SQL_TRACE parameter is set to FALSE
C
The Enterprise Manager Grid Control is not used.
D
The STATISTICS_LEVEL parameter is set to BASIC
E
The TIMED_STATISTICS parameter is set to FALSE
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单选题You want to be notified when the space usage of an existing critical tablespace has reached 75% of the allocated space. Which option would you use to achieve this？（）Arun a procedure to check the tablespace space usageBdefine the warning threshold for the tablespace at 75% in Database ControlCcreate a trigger to be executed when tablespace space usage reaches 75%Dsubmit a job by using DBMS_JOB package to check the free space in the tablespace at regular intervalsEdefine the warning threshold to be 75% for the tablespace by ALTER TABLESPACE .. ADD THRESHOLD command
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