75、Which statements are correct regarding indexes? (Choose all that apply.)

A. A non-deferrable PRIMARY KEYor UNIQUE KEYconstraint in a table automatically attempts to creates a unique index.

B. Indexes should be created on columns that are frequently referenced as part of any expression.

C. When a table is dropped, the corresponding indexes are automatically dropped.

D. For each DML operation performed, the corresponding indexes are automatically updated.

Correct Answer: ACD

Section: (none)

Explanation:解析,有点数据库管理的意思

【OCP-12c】2019年CUUG OCP 071考试题库(75题)的更多相关文章

  1. 【OCP-12c】2019年CUUG OCP 071考试题库(74题)

    74.View the exhibit and examine the structure of ORDERS and CUSTOMERS tables. ORDERS Name     Null?  ...

  2. 【OCP-12c】2019年CUUG OCP 071考试题库(80题)

    80.View the exhibit and examine the structure in ORDERS and ORDER_ITEMS tables. You need to create a ...

  3. 【OCP-12c】2019年CUUG OCP 071考试题库(79题)

    79.Which statement is true about transactions? A. A set of Data Manipulation Language (DML) statemen ...

  4. 【OCP-12c】2019年CUUG OCP 071考试题库(78题)

    78.View the exhibit and examine the structure of the CUSTOMERStable. Which two tasks would require s ...

  5. 【OCP-12c】2019年CUUG OCP 071考试题库(77题)

    77.Which two statements are true about sequences created in a single instance database? (Choose two. ...

  6. 【OCP-12c】2019年CUUG OCP 071考试题库(76题)

    76.View the exhibit and examine the description of the DEPARTMENTSand EMPLOYEEStables. The retrieve ...

  7. 【OCP-12c】2019年CUUG OCP 071考试题库(73题)

    73.Which statement correctly grants a system privilege? A. GRANT CREATE VIEW ON table1 TO user1; B. ...

  8. 【OCP题库-12c】最新CUUG OCP 071考试题库(72题)

    72.View the exhibit for the structure of the STUDENTand FACULTYtables. STUDENT Name Null? Type ----- ...

  9. 【OCP题库-12c】最新CUUG OCP 071考试题库(71题)

    71.(32-18) choose three Which three statements indicate the end of a transaction? (Choose three.) A) ...

随机推荐

  1. WebLogic Server StuckThreadMaxTime value is exceeded during configuration

    WebLogic Server StuckThreadMaxTime value is exceeded during configuration If you are configuring Web ...

  2. Maven(五)使用Nexus搭建Maven私服

    文章装载于:http://blog.csdn.net/jun55xiu/article/details/39497089 Nexus介绍 Nexus是Maven仓库管理器,如果你使用Maven,你可以 ...

  3. bootargs中ip段各项解释

    目标板:合众达的SEED-DVS6467开发板 内核版本:2.6.10 最近同事测试板卡nfs挂载PC的文件系统时出现点问题,PC上ifconfig中显示以太网为eth3,然而板卡启动参数列表相关信息 ...

  4. 新手C#异常的学习2018.08.07

    异常是在程序执行期间出现的问题.C# 中的异常是对程序运行时出现的特殊情况的一种响应,比如尝试除以零. class Program { static void Main(string[] args) ...

  5. 5-青蛙的约会(ex_gcd)

    青蛙的约会 Time Limit: 1000MS   Memory Limit: 10000K Total Submissions:122411   Accepted: 25980 Descripti ...

  6. java高级工程师(二)

    一.Java底层基础题 1.SpringMVC的原理以及返回数据如何渲染到jsp/html上? 答:Spring MVC的核心就是 DispatcherServlet , 一个请求经过 Dispatc ...

  7. 数据结构notes

    1. 一份很好的数据结构教程,图文并茂,简明扼要,列出每种结构的定义和优缺点,非常适合初学者 via @ranyif https://www.interviewcake.com/data-struct ...

  8. <!DOCTYPE html>的重要性!

    噩梦开始的源头:之前写html或者jsp页面,从来不注意doctype的声明,也不太明白doctype的作用. 直到最近碰到了一个非常奇葩的bug:某一个页面在IE7和8,Chrome,ff等下正常, ...

  9. 网络爬虫--requests库中两个重要的对象

    当我们使用resquests.get()时,返回的时response的对象,他包含服务器返回的所有信息,也包含请求的request的信息. 首先: response对象的属性有以下几个, r.stat ...

  10. 数据挖掘潜规则zz

    声明:本文指的是做数据挖掘这行,不是数据仓库 我干这行有几年了,见了很多人,干了很多公司,爆一爆这个行业的状况吧……让后来人有所了解,也让猎头挖人挖的有点方向,起码和candidates聊天的时候不至 ...