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原创 Linux操作系统 作者:jbymy2000 时间:2012-03-05 09:28:31 0 删除 编辑
31. You have specified the warning and critical threshold values of a
n application tablespace to be 60% and 70% respectively. From the tab
lespace space usage metrics, you find that the actual space usage has
reached the specified warning threshold value, but no alerts have be
en 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.
Answer: D
statistics_level 默认是typical,在10g 中表监控是激活的,强烈建议在
10g 中此参数的值是typical.如果STATISTICS_LEVEL 设置为basic,不仅不能监
控表,而且将禁掉如下一些10g 的新功能:
ASH(Active Session History)
ASSM(Automatic Shared Memory Management)
AWR(Automatic Workload Repository)
ADDM(Automatic Database Diagnostic Monitor)

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