（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 FALSE
CThe Enterprise Manager Grid Control is not used.
DThe STATISTICS_LEVEL parameter is set to BASIC
EThe TIMED_STATISTICS parameter is set to FALSE
正确答案
答案解析
略
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