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Difficulty in Writing of Salesforce DEX-450 Exam

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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 platformCreate a custom objectCreate custom fieldsCreate relationship fields

2. Work Effectively with Custom Objects and Fields

Create formula fieldsCreate roll-up summary fieldsDescribe 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 ApexExecute simple ApexUse 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, SOQLProcess the result of a query in ApexCreate a query dynamically at run-time Use SOQL to Query - Parent-Child RelationshipsDescribe a relationship queryWrite a query that traverses a child-to-parent relationshipWrite a query that traverses a parent-to-child relationship

5. DML Essentials

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

6. Trigger Essentials

Describe what a trigger is used forDescribe the syntax of a trigger definitionUse trigger context variables

7. Apex Class Essentials

Describe how Apex classes are usedDefine an Apex classDetermine what data an Apex class can access

8. The Save Order of Execution and Apex Transactions

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

9. Testing Essentials

Describe Apex's testing frameworkCreate test dataWrite and run an Apex test

10. Testing Strategies

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

11. Strategies for Designing Efficient Apex Solutions

Determine your code coverage percentagesCreate 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 limitationsDescribe ways in which you can use declarative functionality to improve your programmatic solutions

13. Creating Visualforce Pages

Create a Visualforce pageReference a standard controllerLaunch a Visualforce page using a custom buttonDisplay data from a record in a Visualforce page

14. Exploring the View and Controller Layers of Visualforce

Create a Visualforce pageDisplay related dataInvoke standard controller actions

15. Working with Custom Controllers and Controller Extensions

Create controller extensionsCreate a custom controllerWork with propertiesUse PageReferencesInvoke custom methods in Visualforce pages14.Working with List Controllers and SOSL Queries

Use a standard list controller in a Visualforce pageCreate a SOSL queryCreate a custom list controller

16. Visualforce Development Considerations

Determine whether a declarative solution exists for your requirementsDescribe common governor limit issues and security concernsDescribe Visualforce strategies Testing Visualforce ControllersDescribe how a Visualforce controller interacts with the viewWrite tests for controller constructorsWrite tests for action methods, getters, setters, and properties

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Salesforce Programmatic Development using Apex and Visualforce in Lightning Experience Sample Questions (Q52-Q57):

NEW QUESTION # 52
A developer is tasked with building a custom Lightning web component to collect Contact information.
The form will be shared among many different types of users in the org. There are security requirements that only certain fields should be edited and viewed by certain groups of users.
What should the developer use in their Lightning Web Component to support the security requirements?

• A. force-input-field
• B. lightning-input-field
• C. ui-input-field
• D. aura-input-field

Answer: B

Explanation:
To support field-level security and sharing in a Lightning Web Component (LWC) form that collects Contact information, and to ensure that only certain fields are editable and viewable by specific user groups, the developer should use the appropriate base components that respect these security settings.
Option B: lightning-input-field
Correct Choice.
The lightning-input-field component is used within lightning-record-edit-form or lightning-record-view-form.
It automatically enforces field-level security and sharing rules.
It ensures that users only see and edit fields they have access to, based on their profile and permission sets.
force-input-field is not a valid Lightning Web Component.
It was used in Aura components but is not applicable in LWC.
Option C: ui-input-field
Incorrect.
ui-input-field is not a valid component in LWC.
The ui namespace components are deprecated and were part of Aura components.
Option D: aura-input-field
Incorrect.
There is no component named aura-input-field.
Aura components use different base components, but this is not applicable to LWC.
Conclusion:
To meet the security requirements and support field-level security in the LWC form, the developer should use lightning-input-field within a lightning-record-edit-form.
Reference:
lightning-input-field Documentation
Enforce Field-Level Security
Incorrect Options:
Option A: force-input-field
Incorrect.

 

NEW QUESTION # 53
A developer is designing a new application on the Salesforce platform and wants to ensure it can support multiple tenants effectively.
Which design framework should the developer consider to ensure scalability and maintainability?

• A. Flux (view, action, dispatcher, and store)
• B. Waterfall Model
• C. Model-View-Controller (MVC)
• D. Agile Development

Answer: D

 

NEW QUESTION # 54
Which two queries can a developer use in a Visualforce controller to protect against SOQL injection vulnerabilities? Choose 2 answers

• A. String qryName = % + String.escapeSingleQuotes(name)+ % ;
  String qryString = SELECT Id FROM Contact WHERE Name LIKE :qryNAme ;
  List queryResults = Database.query(qryString);
• B. String qryName = % + name % ;
  String qryString = SELECT Id FROM Contact WHERE Name LIKE :qryNAme ;
  List queryResults = Database.query(qryString);
• C. String qryName = % + String.enforceSecurityChecks(name)+ % ;
  String qryString = SELECT Id FROM Contact WHERE Name LIKE :qryNAme ;
  List queryResults = Database.query(qryString);
• D. String qryString = SELECT Id FROM Contact WHERE Name LIKE :qryNAme ; List queryResults = Database.query(qryString);

Answer: A,B

 

NEW QUESTION # 55
A company's engineering department is conducting a month-long test on the scalability of an in-house-developed software that requires a cluster of 100 or more servers. Which of the following models is the best to use?

• A. PaaS
• B. laaS
• C. SaaS
• D. BaaS

Answer: B

Explanation:
Infrastructure as a Service (IaaS) is the best model for the scenario described because it provides on-demand access to compute, storage, and networking resources that are ideal for a scalable server cluster. IaaS allows the engineering team to rent infrastructure resources without having to invest in physical hardware, making it perfect for temporary or fluctuating workloads, such as scalability testing.
Key Characteristics of IaaS:
Full control over the operating systems and applications running on the servers.
Flexible resource allocation to support high scalability.
Ideal for custom software testing where specific server configurations may be needed.
Why not the other options?
PaaS (Platform as a Service):
While PaaS is excellent for application development and deployment, it abstracts the infrastructure layer, which would limit the engineering team's control over the cluster's configuration.
SaaS (Software as a Service):
SaaS delivers fully managed applications, not infrastructure or testing environments. It's irrelevant for this use case.
BaaS (Backend as a Service):
BaaS is tailored to mobile or web application backend development, providing APIs and pre-built services, not infrastructure for a server cluster.
Platform Developer Reference:
While this question is broader than Salesforce-specific concepts, understanding IaaS vs. PaaS is relevant when working with Salesforce development. For example:
Salesforce operates as a PaaS (e.g., Force.com platform), allowing developers to build and deploy applications without managing underlying servers.
Testing scalability and performance at an infrastructure level (as in the question) would fall under IaaS concepts, which Salesforce developers might encounter when integrating external services or infrastructure like AWS, Azure, or Google Cloud.
This foundational knowledge complements your understanding of cloud services in the Salesforce ecosystem.

 

NEW QUESTION # 56
Universal Container wants Opportunities to no longer be editable when reaching the Clousd stage.
How should a develoiper accomplish this?

• A. Use a validation rule.
• B. Use flow Builder
• C. Mark fields as read-only on the page layout.
• D. Use the Process Automation setting.

Answer: A

 

NEW QUESTION # 57
......

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