DEX-450 Exam Study Guide Free Practice Test LAST UPDATED DATE Oct 27, 2022

The New DEX-450 2022 Updated Verified Study Guides & Best Courses

Topics of Salesforce DEX-450 Exam

Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts.
DEX-450 exam will include the following topics:

1. Objects and Fields

Describe the capabilities of objects on the Salesforce platform
Create a custom object
Create custom fields
Create relationship fields

2. Work Effectively with Custom Objects and Fields

Create formula fields
Create roll-up summary fields
Describe the capabilities of record types

3. Programming with Apex

Describe key aspects of Apex that differentiate it from other languages, such as Java and C#
Describe why Apex transactions and governor limits must be considered when writing Apex
Execute simple Apex
Use the sObject data type, the primitive data types, and basic control statements in Apex

4. Use SOQL to Query Your Org’s Data

Write a basic query using Salesforce’s query language, SOQL
Process the result of a query in Apex
Create a query dynamically at run-time Use SOQL to Query – Parent-Child Relationships
Describe a relationship query
Write a query that traverses a child-to-parent relationship
Write a query that traverses a parent-to-child relationship

5. DML Essentials

List the differences between the ways you can invoke DML operations
Write Apex to invoke DML operations and handle DML errors

6. Trigger Essentials

Describe what a trigger is used for
Describe the syntax of a trigger definition
Use trigger context variables

7. Apex Class Essentials

Describe how Apex classes are used
Define an Apex class
Determine what data an Apex class can access

8. The Save Order of Execution and Apex Transactions

Describe key points in the Order of Execution
Describe how triggers fit into and can be impacted by the Order of Execution
Describe the lifecycle of an Apex Transaction
Describe the memory lifecycle for static variables

9. Testing Essentials

Describe Apex’s testing framework
Create test data
Write and run an Apex test

10. Testing Strategies

Describe practices for writing code that is easy to maintain and extend
Write triggers and classes that assume batches of data as input
Write code that works efficiently with the database, both in querying and using DML

11. Strategies for Designing Efficient Apex Solutions

Determine your code coverage percentages
Create tests using best practices

12. Trigger Design Strategies

List declarative mechanisms you can use to implement complex business logic, for what types of problems they are best used, and their limitations
Describe ways in which you can use declarative functionality to improve your programmatic solutions

13. Creating Visualforce Pages

Create a Visualforce page
Reference a standard controller
Launch a Visualforce page using a custom button
Display data from a record in a Visualforce page

14. Exploring the View and Controller Layers of Visualforce

Create a Visualforce page
Display related data
Invoke standard controller actions

15. Working with Custom Controllers and Controller Extensions

Create controller extensions
Create a custom controller
Work with properties
Use PageReferences
Invoke custom methods in Visualforce pages
14.Working with List Controllers and SOSL Queries

Use a standard list controller in a Visualforce page
Create a SOSL query
Create a custom list controller

16. Visualforce Development Considerations

Determine whether a declarative solution exists for your requirements
Describe common governor limit issues and security concerns
Describe Visualforce strategies Testing Visualforce Controllers
Describe how a Visualforce controller interacts with the view
Write tests for controller constructors
Write tests for action methods, getters, setters, and properties

What is the duration, language, and format of Salesforce DEX-450 Exam

• The type of questions is Multiple Choice and situation-based questions.
• This exam consists of 85 questions
• There is a time limit of 120 minutes for the exam.

The validity of the Salesforce DEX-450 certification is three years.

NO.120 Given the code below:

What should a developer do to correct the code so that there is no chance of hitting a governor limit?

 Rework the code and eliminate the for loop.

 combine the two SELECT statements into a single SOQL statement.

 Add a WHERE clause to the first SELECT SOQL statement.

 Add a LIMIT clause to the first SELECT SOQL statement.

NO.121 A visualforce interface is created for Case Management that includes both standard and custom functionality defined in an Apex class called myControllerExtension. The visualforce page should include which <apex:page> attribute(s) to correctly implement controller functionality?

 StandardController = “case” and extensions =” myControllerExtension”

 Extensions=” myControllerExtension”

 Controller=” myControllerExtension”

 Controller = “case” and extensions =” myControllerExtension”

NO.122 一家建筑公司的运营经理使用名为 "机械 "的自定义对象来管理起重机和其他机械的使用和维护。该经理希望能够将机械分配给不同的施工任务，并跟踪与每个任务相关的日期和成本。一项施工任务可以分配多台机械。
开发人员应如何满足这些要求？

 在 "施工作业 "对象上为 "机械 "对象创建一个查找字段。

 在 "机械 "对象上为 "施工作业 "对象创建一个查找字段。

 创建一个与机械对象和施工作业对象都具有主-详细关系的连接对象。

 在 "机械 "对象和 "施工作业 "对象上创建主-详细查询。

第 123 号 哪些操作可能导致触发器触发？

 更新馈送项目

 重命名或替换选取列表条目

 选中转账分区选项时更改用户的默认分区

 级联删除操作

第 124 号 什么情况下需要使用 Apex 触发器而不是流程生成器流程？

 需要创建记录时

 需要更新与触发记录相关的多个记录时

 需要在 Chatter 上创建帖子时

 当需要对删除或取消删除进行操作时，或在执行 DML 操作之前。

第 125 号 Review_c 对象与 job_Application_c 对象有查找关系。job_Application_c 对象与 position_c 对象具有主详细信息关系。这种关系基于自动填充的默认值？
在单个 Position_c 记录的 Visualforce 页面上显示来自相关审阅 _C 记录的字段数据的推荐方法是什么？请选择以下方式之一：

 利用职位_c 的标准控制器和 Job_Application_c 对象上的跨对象公式字段来显示审阅_c 数据。

 利用 Position_c 的标准控制器和控制器扩展查询 Review_c 数据。

 利用 "页面 "中的 Position_c 标准控制器和表达式语法，通过注入 Job_Applicacion_c 显示相关的 Review_c。

 利用 Position_c 的标准控制器和 Review_c 对象上的跨对象公式字段来显示 Review_c 数据。

NO.126 迭代名为 AccountList 的 List 集合中的每个账户时，有哪两个有效选项？(请选择两个）。

 for (Account theAccount : AccountList) {...}

 for(AccountList) {...}

 for (List L : AccountList) {...}

 for (Integer i=0; i < AccountList.Size(); i++) {...}

NO.127 开发人员使用下面的代码块创建了一个自定义控制器和一个自定义 Visualforce 页面：
公共类 MyController {
公共字符串 myString {
获取 {
如果 (myString == null) { myString = 'a'；
}
return myString；
} private set; } public string getMyString (){
返回 'getMyString'；
} public string getStringMethod () {
如果 (myString == null) {
myString = 'b'；
} 返回 myString；
}
} {! 用户访问自定义页面时会看到什么？

 A, a, a

 B、b、b

 A、b、getMyString

 B、a、getMyString

编号 128 开发人员何时可以在 Force.com 应用程序中使用自定义 Visualforce 页面？(选择 2）

 生成包含应用程序数据的 PDF 文档

 为仪表盘和布局创建组件

 在两个组织之间部署组件

 修改自定义对象的页面布局设置

NO.129 开发人员如何在触发器中就违反 SOQL 治理限制的情况向用户发出警告？

 使用 ApexMessage.Message() 在 SOQL 查询次数超过限制后显示错误信息。

 在 SOQL 查询次数超过限制之前，使用 PageReference.setRedirect() 将用户重定向到自定义 Visualforce 页面。

 使用 Messaging.SendEmail() 继续执行事务，并在 SOQL 查询次数超过限制后向用户发送警报。

 使用 Limits.getQueries()，并在 SOQL 查询次数超过限制前显示错误信息。

编号 130 开发人员的任务是对系统中存在的 ContactSearch Apex 类进行安全审查。在该类中，开发人员发现以下方法存在安全威胁：List performSearch(String lastName){ return Database.query('Select Id, FirstName, LastName FROM Contact WHERE LastName Like %'+lastName+'%); }开发人员可以通过哪两种方法更新该方法以防止 SOQL 注入攻击？选择 2 个答案

 使用变量绑定，用静态 SOQL 代替动态查询。

 使用 escapeSingleQuote 方法在使用前对参数进行消毒。

 在参数上使用正则表达式删除特殊字符。

 在类上使用 @Readonly 注解和 with sharing 关键字。

第 131 号 在启用了多种货币的组织中，开发人员需要使用 Campaign 上名为 Total_estimated_value__c 的滚动汇总字段，汇总来自 CampaignMember 对象的 Estimated_value__c 货币字段的总和。

 Campaignmember.Estimated_value__c中的值转换为活动记录的货币，总和使用活动记录上的货币显示。

 CampaignMember.Estimated_value__c 中的值会转换为大多数 CampaignMember 记录中的货币，并使用该货币显示总和。

 将 CampaignMember.Estimated_value__c 中的值相加，得到的 Total_estimated_value__c 字段将作为数字字段显示在 Campaign 记录上。

 CampaignMember.Estimated_value__c 中的值会转换成当前用户的货币，并使用 Campaign 记录中的货币显示总和。

第 132 号 开发人员可以从哪两个位置确定沙箱的整体代码覆盖率？请选择两个答案

 Apex 类设置页面

 在开发人员控制台面板上运行测试套件

 开发人员控制台的 "测试 "选项卡

 Apex 测试执行页面

第 133 号 系统中存在一个 Licensed_Professional__c 自定义对象，该对象有两个主详情字段，分别用于以下对象：认证__c 和联系人。认证代表 "角色的用户可以访问他们拥有的认证记录并查看相关的持证专业人员记录，但 "销售代表 "角色的用户报告说，他们无法查看任何持证专业人员记录，即使他们拥有相关的联系人记录。销售代表 "角色的用户无法访问 "持证专业人员 "记录的两个可能原因是什么？选择 2 个答案

 该组织的 Licensed_Professional__c 共享规则尚未完成重新计算过程。

 组织最近修改了销售代表角色，限制对 Licensed_Professional__c 的读/写访问权限。

 该组织拥有认证__c 的私有共享模式，"联系 "是 Licensed_Professional__c 对象中的主要关系

 该组织对认证__c 采用私有共享模式，认证__c 是 Licensed_Professional__c 对象中的主要关系。

第 134 号 Visualforce 页面和/或控制器中的哪些代码可能存在安全漏洞？

 <apex:outputField value=”{!ctrl.userInput}” />

 <apex:outputText escape=”false” value=” {!$CurrentPage.parameters.userInput}” />

 <apex:outputText value=”{!£CurrentPage.parameters.userInput}” />

 <apex:outputField escape=”false” value=”{!ctrl.userInput}” />

第 135 号 将代码从沙箱部署到生产环境时，有哪两个测试注意事项？选择 2 个答案

 测试的 75% 必须无故障执行

 测试的 100% 必须无故障执行

 Apex 代码需要 75% 覆盖范围

 Apex 代码要求 100% 覆盖范围

第 136 号 开发人员被要求创建一个 Visualforce 页面，列出当前用户拥有的联系人。该组件将嵌入到 Lightning 页面中。
在不编写不必要代码的情况下，应该使用哪个控制器来实现这一目的？

 Standard list controller

 Standard controller

 Lightning controller

 Custom controller

NO.137 Which three per-transaction limits have higher governor limits in asynchronous Apex transactions?

 Maximum CPU time

 Maximum heap size

 Total SOQL queries

 Maximum execution time

 Records returned by SOQL

NO.138 A developer has the following requirements:
Calculate the total amount on an Order.
Calculate the line amount for each Line Item based on quantity selected and price.
Move Line Items to a different Order if a Line Item is not stock.
Which relationship implementation supports these requirements?

 Line Items has a Master-Detail field to Order and the Master can be re-parented.

 Line Item has a Lookup field to Order and there can be many Line Items per Order

 Order has a Lookup field to Line Item and there can be many Line Items per Order.

 Order has a Master-Detail field to Line Item and there can be many Line Items per Order.

 Loading …

Benefits in Obtaining Salesforce DEX-450 Certification

71 percent of bachelor’s degree expert methodology and energetic methodology certified methodologists receive up to another 16 percent are recorded in the Salesforce annual analytical compensation survey. The certification from Salesforce DEX-450 strengthens your expertise as well as your know-how to ensure that your views are agile in a system of market research.
The physical test applicants of the Salesforce DEX-450 certification perceive a fresh advantage on other comrades when being interviewed. In the project market, aspirants find themselves even more aggressive. Salesforce DEX-450 is understood worldwide so that certified aspirants, along with methods of organizational analysis, are simply more self-confident.

The DEX-450 qualification from Salesforce enhances your expertising and expertise to apply an agile perspective within a system of corporate research. At the interview DEX-450 examiners pick a corner over other comrades. In the labour market, aspirants are more competitive.

Get Prepared for Your DEX-450 Exam With Actual 295 Questions: https://www.real4prep.com/DEX-450-exam.html

         

Related Links: www.stes.tyc.edu.tw www.stes.tyc.edu.tw myportal.utt.edu.tt myportal.utt.edu.tt www.stes.tyc.edu.tw myportal.utt.edu.tt