题目内容
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[主观题]
何谓Sampling plan
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A.收集资料 data collection
B.确定研究问题 to determine a research topic
C.确定抽样方案 to determine the type of sampling
D.制定调查方案 to make an investigation plan
更多“何谓Sampling plan”相关的问题
第2题
开展问卷调查的第一步骤是 The first step in conducting a questionnaire survey is
A.收集资料 data collection
B.确定研究问题 to determine a research topic
C.确定抽样方案 to determine the type of sampling
D.制定调查方案 to make an investigation plan
第3题
● Perform Quality Control is the process of monitoring and recording results of executing
the Quality Plan activities to assess performance and recommend necessary changes．(74) are the techniques and tools in performing quality control．
点击查看答案
Statistical sampling ① Run chart ②
Control charts ③ Critical Path Method ④
Pareto chart ⑤ Cause and effect diagrams ⑥
(74)
A．①②③④
B．②③④⑤
C．①②③⑤⑥
D．①③④⑤⑥
第4题
Examine the parameter for your database instance:You generated the execution plan for the
following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan:Identify the reason why the optimizer chose different execution plans.（）
点击查看答案
A. The optimizer used a dynamic plan for the query.
B. The optimizer chose different plans because automatic dynamic sampling was enabled.
C. The optimizer used re-optimization cardinality feedback for the query.
D. The optimizer chose different plan because extended statistics were created for the columns used.
第5题
Which three statements are true about SQL plan directives？（）
A. They are tied to a specific statement or SQL id.
B. They instruct the maintenance job to collect missing statistics or perform dynamic sampling to generate a more optimal plan.
C. They are used to gather only missing statistics.
D. They are created for a query expression where statistics are missing or the cardinality estimates by the optimizer are incorrect.
E. They instruct the optimizer to create only column group statistics.
F. Improve plan accuracy by persisting both compilation and execution statistics in the SYSAUX tablespace.
第6题
Perform. Quality Control is the process of monitoring and recording results of executing t
he Quality Plan activities to assess performance and recommend necessary changes. ______ are the techniques and tools in performing quality control.. ① Statistical sampling ② Run chart ③ Control charts ④ Critical Path Method ⑤ Pareto chart ⑥ Cause and effect diagrams
点击查看答案
A．①②③④
B．②③④⑤
C．①②③⑤⑥
D．①③⑤⑥
第7题
Examine the parameters for your database instance:Which three statements are true about the process of automatic optimization by using cardinalityfeedback？（）
A. The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.
B. The optimizer can re optimize a query only once using cardinality feedback.
C. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
D. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
E. After the optimizer identifies a query as a re-optimization candidate, statistics collected by thecollectors are submitted to the optimizer.
第9题
The highest frequency of a signal is ,sampling angular frequency is , , in order to avoid aliasing when sampling this signal, what pre-processing is required before sampling （）
A.quantization
B.denoising
C.modulation
D.anti-aliasingfiltering
第11题
Whatisthetermthatisusedtodescribetheprocessofconvertingasignalfromdigitaltoanalog？（）
A.packetization
B.quantization
C.decoding
D.sampling
