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In which cases is reference partitioning effective in enhancing performance?()

题目
In which cases is reference partitioning effective in enhancing performance?()

A. It is effective only in partition pruning.

B. It is effective only in partitionwise joins provided that the query predicates are different from the partitioning key.

C. It is effective in both partition pruning as well as partitionwise joins provided that the query predicates are identical to the partitioning key.

D. It is effective in both partition pruning as well as partitionwise joins irrespective of whether the query predicates are different from or identical to the partitioning key.

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相似问题和答案

第1题：

The government official said that the new tax rates would come into ______ (effective) from April.


正确答案：effect
effect

第2题：

WhichofthefollowinglistsofitemsallrequireanHMCtofunctionwithPOWER5?()

A.RunningAIX5.3ImplementingHACMPImplementingStaticLPAR

B.ImplementingAdvancedPOWERVirtualizationRunningLinuxAttachingRIOdrawers

C.ImplementingVIOServerImplementingDynamicLPARRunningwithSMTturned"On"

D.RunningAIXandLinuxonthesamesystemImplementingCoDImplementingMicro-Partitioning


参考答案：D

第3题：

Being an ()manager means knowing when to use the right management style.

A、affective

B、emotional

C、effective


参考答案：C

第4题：

Reference
Reference means what a linguistic form refers to in the real physical world; it deals with the relationship between the linguistic element and the non-linguistic world of experience.
略

第5题：

ospf cost和bandwidth－reference命令同时配置的时候,接口上的cost值以bandwidth－reference配置为准

A．错误

B．正确


参考答案：A

第6题：

解释什么是Partitioning（分区）以及它的优点。


正确答案：
 

第7题：

WhichofthefollowingfeaturessetsIBMapartfromcompetitorsintheareaofpartitioning?()

A.Softwaresupport

B.Hardwareisolation

C.Staticchangesinpartitions

D.Micro-Partitioning


参考答案：D

第8题：

He never arrives on time and my is that he feels the meetings are useless.

A) conference       B) inference         C) preference         D) reference

 


应该选B) inference 

第9题：

It is important to learn to communicate.

A:minor
B:crucial
C:impossible
D:effective

答案：B
解析：
本题考查的是对形容词的认知。这句话的意思是：学会沟通是非常重要的。important的意思是重要的。选项A minor较少的，次要的。选项B crucial关键的，非常重要，例如：These negotiations are crucial to the future of our firm．这次谈判对我们公司的未来很重要。选项C impossible不可能的。选项D effective有效的。important和crucial 意思最接近，所以选B。

第10题：

如何在已经创建好的表上添加一个外键（）。

A．Alter table 表名add foreign key（键名）reference 关联表（关联键名）

B．Alter table 表名add Primary key（键名）reference 关联表（关联键名）

C．Alter 表名add foreign key（键名）reference 关联键名

D．Alter 表名add Primary key（键名）reference 关联表（关联键名）


A

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