题目
第1题
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2题
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
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
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
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
A.①②③④
B.②③④⑤
C.①②③⑤⑥
D.①③⑤⑥
第7题
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
A.quantization
B.denoising
C.modulation
D.anti-aliasingfiltering
第11题
A.packetization
B.quantization
C.decoding
D.sampling
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