Which two kinds of failures make the Data Recovery Advisor (DRA)generate a manual checklist? ()A. failures because a data file is renamed by errorB. failures when no standby database is configuredC. failures that require no archive logs to be applied for

题目
Which two kinds of failures make the Data Recovery Advisor (DRA)generate a manual checklist? ()

A. failures because a data file is renamed by error

B. failures when no standby database is configured

C. failures that require no archive logs to be applied for recovery

D. failures due to loss of connectivity-for example, an unplugged disk cable

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  • 第1题：

    Evaluatethefollowingcode：SQL>VARIABLEtask_nameVARCHAR2（255）；SQL>VARIABLEsql_stmtVARCHAR2（4000）；SQL>BEGIN：sql_stmt：=’SELECTCOUNT（*）FROMcustomersWHEREcust_state_province=’’CA’’’；：task_name：=’MY_QUICKTUNE_TASK’；DBMS_ADVISOR.QUICK_TUNE（DBMS_ADVISOR.SQLACCESS_ADVISOR，：task_name，：sql_stmt）；END；Whatistheoutcomeofthisblockofcode？（）

    A.Itcreatesataskandworkload，andexecutesthetask.

    B.Itcreatesataskandworkloadbutdoesnotexecutethetask.

    C.Itproducesanerrorbecauseatemplatehasnotbeencreated.

    D.ItproducesanerrorbecausetheSQLTuningSethasnotbeencreated.


    参考答案：A

  • 第2题：

    1. 创建并访问DataFrame对象。 1) 创建3×3DataFrame数据对象：数据内容为1-9；行索引为字符a，b，c；列索引为字符串‘one’，‘two’，‘three’； 2) 查询列索引为‘two’和‘three’两列数据； 3) 查询第0行、第2行、第0列、第2列数据； 4) 筛选第1列中值大于2的所有行数据，另存为data1对象； 5) 为data1添加一列数据，列索引为‘four’，值都为10； 6) 将data1所有值大于9的数据修改为8； 7) 删除data1中第0行和第1行数据。


    t;>>data=[[4,5,6], [4,5,6], [4,5,6]];t;>>df=pd.DataFrame(data,columns=list(‘ABC’));以将df中值为5的数据修改为10的语句是：};df[df.values==5]=10

  • 第3题：

    在ggplot2中，自定义散点图中点的颜色所用的命令为（）

    A．scale_colour_manual()

    B．scale_linetype_manual()

    C．scale_shape_manual()

    D．scale_size_manual()


    geom_point()

  • 第4题：

    对于以下代码描述有误的是？ val data = Map（1 -＞ "One", 2 -＞ "Two") val res = for（（k, v) ＜- data; if（k ＞ 1)) yield v

    A．运行后res的结果为List("Two")

    B．运行后res的结果为List("One", "Two")

    C．对映射data中的每一个(键，值)对，k被绑定对键，而v则被绑定到值

    D．其中的if(k ＞ 1)是一个守卫表达式


    B

  • 第5题：

    WordCloud类的generator方法的功能是：

    A．generate(text)在text路径中生成词云

    B．generate(text)生成词云的宽度为text

    C．generate(text)生成词云的高度为text

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    在标量数据可视化实例中，generate_values（n, grid.point_data.scalars.range)方法中属性n表示什么？

    A．等值面的数量

    B．等值面的颜色映射

    C．等值面的范围

    D．等值面实体的透明度


    等值面的数量

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