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
题目
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.（）
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.
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更多“Examine the parameter for your database instance:You generated the execution plan for the ”相关问题
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第1题：
Merry Christmas, George! Here is a card for ________, with ________ best withes.A.you…your
B.you…our
C.us…our
D.us…your
参考答案：B
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第2题：
检查
A.expect
B.except
C.excuse
D.examine
正确答案：D
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第3题：
Compare this with what happens in the mass production of poultry:there are battery farms,for example,where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish.Chickens kept in this way are not only tastel ess asfood;they also（ ）eggs which lack important vitamins.A.produce
B.manufacture
C.generate
D.raise答案：A解析：produce用途较广，侧重于制成品的数量，有生产，制造，产生，生（子女），出产等含义。句意：用这种方法喂的鸡吃起来不仅没味道，它们生出的蛋也缺乏重要的维生素。B.manufacture使用范围较窄，一般指用机器制造大量货物。如：manufacture cement,cookers制造水泥、炉具；C.generate一般指产生热、电、动力等。 -
第4题：
After __________ (examine) the lady, the doctor suggested that his back was badly hurt in the accident.参考答案：being examined
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第5题：
（ ） – Is Miss White __________ English teacher, Maria?
– No, she teaches __________ geography.
A．your；my
B．you；mine
C．you；us
D．your；us
正确答案：D
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第6题：
He rolled up his trouer leg to exhibit his wounded knee.A:spread
B:open
C:show
D:examine答案：C解析：本句意思：他卷起他的裤腿来显露受伤的膝盖。exhibit展示，显示。spread伸开，展开；open打开；show展示，出示；examine检查。