单项选择题

A.It degrades the run time and compiler performance.B.I……

In your database server， the parameter PLSQL_OPTIMIZE_LEVEL has been set to 2. What would this setting achieve？（）

A.It degrades the run time and compiler performance.
B.It provides better run time and compiler performance.
C.It provides better optimization of the statement during parse time.
D.It forces the rule based optimizer to be used for statement optimization.
E.It provides better run time performance but slightly degraded compiler performance.
F.It provides better run time performance but slightly degraded run time performance.

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单项选择题YouworkasadatabaseadministratorforSupportcenter.cn.Youfindthatreportsarerunningforalongtimeinyourdatawarehousingapplications.Yoususpectalackofindexesisthereasonfortheperformancedegradation.Whichadvisorycomponentwouldyoureferto，inordertodeterminetheappropriateindexes？（）

A.Memory Advisors
B.Segment Advisors
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多项选择题YouworkasadatabaseadministratorforSupportcenter.cn.YouhavesettheretentionperiodforAutomaticRepository（AWR）statisticstofourdaysandcollectionintervalto15minutes.YouwanttoviewthestatisticscollectedandstoredinAWRsnapshot.WhichtwomethodswouldyouusetoviewtheAWRstatistics？（）

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A.The trace file
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A.The instance would hang.
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