Oracle认证考试

View the Exhibit to examine the output produced by the following query at three different times since thedatabase instance started and has experienced workloads of different capacities:SQL> SELECT substr(component, 0, 10) COMP, current_size CS, user_speci

题目

View the Exhibit to examine the output produced by the following query at three different times since thedatabase instance started and has experienced workloads of different capacities:SQL> SELECT substr(component, 0, 10) COMP, current_size CS, user_specified_size US FROM v$memory_dynamic_componentsWHERE current_size!=0;What do you infer from this()

  • A、The database instance is running with manual PGA management.
  • B、The database instance is running with manual shared memory management.
  • C、The database instance has the MEMORY_TARGET value set to a nonzero value.
  • D、All sessions are connected to the database instance in dedicated mode, and no RMAN or parallel queryoperations have been performed
参考答案和解析
正确答案:C
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相似问题和答案

第1题:

CNA中可以通过下列哪几种方式查看BestPCCPCH_RSCP()

A.View In Table

B.View In Grid

C.View In GridChart

D.View In Map

E.View In Statistic


参考答案:A, B, C, D, E

第2题:

选择下面哪一个命令,可以在工作时获得最好的视觉效果()

A.“View-SimpleWireframe”

B.“View-Wireframe”

C.“View-Draft”

D.“View-Enhanced”


参考答案:D

第3题:

What does"a bird's-eye view"mean?

A. See a view with a bird' s eyes.

B. A bird looks at a beautiful view.

C. It is a general view from a high position.

D. If is a scenic place.


正确答案:C
a bird’s-eye view是美国俚语,意为“从高处向下看的景致:俯视”。A项意为“用鸟的眼睛看景点”;B项意为“鸟在看美景”;D项意为风景点。故C为正确选项。

第4题:

删除视图salary的命令是 A) DROP salary VIEW B)DROP VIEW salary C)DELETE salary VIEW D)DELETE salary


正确答案:B
本题考查SQL中删除视图的命令.删除视图的命令格式为:
  DROP VIEW <视图名>
  故选项B为正确答案。

第5题:

What is true about updates through a view? ()

A. You cannot update a view with group functions.

B. When you update a view group functions are automatically computed.

C. When you update a view only the constraints on the underlying table will be in effect.

D. When you update a view the constraints on the views always override the constraints on the underlying tables.


参考答案:A

第6题:

In the past half century, language teaching and learning practices have been influenced by three different views of language, namely, __________.

A.the structural view

B.the functional view and the interactional view

C.the structural view and the interactional view

D.the functional view and the interactional view


参考答案:A

第7题:

在数据库已打开的情况下,利用SQL命令从学生表中派生出含有“学号”、“姓名”和“年龄”字段的视图,下列语句正确的是

A.CREATE VIEW xs_view AS; SELECT学号,姓名,年龄FROM学生表

B.CREATE VIEW xs_view; SELECT学号,姓名,年龄FROM学生表

C.CREATE VIEW xs_view AS; (SELECT学号,姓名,年龄FROM学生表)

D.CREATE VIEW xs_view; (SELECT学号,姓名,年龄FROM学生表)


正确答案:A
解析:在SQL的数据定义功能中,可以对视图进行定义,语句格式为:CREATEVIEWview_name[(column_name[,column_name]...)]ASselect_statement

第8题:

CNA中可以通过()对测试路线上PCCPCHBestRSCP进行分段统计

A.View In Grid

B.View In GridChart

C.View In Table

D.View In Statistic


参考答案:C

第9题:

You are granted the CREATE VIEW privilege. What does this allow you to do? ()

A. Create a table view.

B. Create a view in any schema.

C. Create a view in your schema.

D. Create a sequence view in any schema.

E. Create a view that is accessible by everyone.

F. Create a view only of it is based on tables that you created.


参考答案:C

第10题:

修改本地视图的命令是

A) OPEN VIEW B)CREATE VIEW

C)USE VIEW D)MODIFY VIEW


正确答案:D
修改本地视图的命令是MODIFY VIEW穿件视图的命令是CREATE VIEW,打开视图的命令是USE VIEW,VisualFoxPro中没有OPEN VIEW命令,故选项D为正确答案。

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