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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: User Interface | 18% | - Aura Components - Lightning Web Components (LWC) advanced features - Visualforce advanced controllers - Lightning Data Service |
| Topic 2: Testing, Debugging, and Deployment | 15% | - Deployment tools (SFDX, Metadata API) - Test data strategies and mocking - Debugging and performance profiling - Apex unit testing best practices |
| Topic 3: Integration | 15% | - Platform Events and Change Data Capture - Named Credentials and authentication - REST and SOAP web services (Apex callouts) - External Services and Connect REST API |
| Topic 4: Logic and Process Automation | 22% | - Dynamic Apex and SOQL/SOSL - Advanced Apex programming - Invocable Actions and Platform Events - Asynchronous Apex (Batch, Queueable, Future, Scheduled) |
| Topic 5: Architecture | 18% | - Governor limits and bulkification - Design patterns and Apex trigger frameworks - Namespace and package management - Apex Enterprise Patterns |
| Topic 6: Data Modeling | 12% | - Large data volumes considerations - Advanced object relationships and data modeling - External objects and data sources |
当社のPlat-Dev-301テストトレントは、チャレンジに取り組み、Plat-Dev-301試験に合格するのに役立つ新しい方法を探し続けています。そして、Plat-Dev-301認定テストは長い間集中しており、教材の設計で大量のリソースと経験を蓄積してきました。あなたが楽しみにしているPlat-Dev-301試験の証明書を取得するのを助けるために、熟練した意欲的なスタッフがたくさんいます。私たちはプロのチームとPlat-Dev-301学習ツールを信頼しており、心から信頼してください。
質問 # 125
Refer to the markup below:
A Lightning web component displays the Account name and two custom fields out of 275 that exist on the abject. The custom fields are correctly declared and populated. However, the developer receives complaints that the component performs slowly. What can the developer do to improve the performance?
正解：B
解説：
To improve performance, the developer should specify only the fields needed by using the fields attribute in the lightning-record-form instead of loading all fields with layout-type="Full". This reduces the amount of data being retrieved and processed, thus improving the component's performance.
質問 # 126
Which two queries are selective SOQL queries and can be used for a large data set of 200,000 Account records?
Choose 2 answers
正解：C、D
解説：
Selective queries in SOQL are optimized for performance. Query B is selective because it filters out empty names, which are likely to be less in number. Query C is selective if the list of names is small, and 'Customer_Number_c' is indexed or can be used as an external ID field. Working with Very Large SOQL Queries
質問 # 127
The head of recruiting at Universal Containers (UC) wants to provide all internal users the ability to search for open positions by role, department, and location via a new recruiting app. In addition to search, users of the app should be able to refer a friend, apply for a position, and review the status of their current submissions.
The app will be surfaced to UC's existing iOS and Android users via the standard mobile app that Salesforce provides. It has a custom user interface design and offline access is not required.
Given these requirements, what is the recommended approach to develop the app?
正解：D
質問 # 128
A developer is inserting, updating, and deleting multiple lists of records in a single transaction and wants to ensure that any error prevents all execution.
How should the developer implement error exception handling in their code to handle this?
正解：C
解説：
Using Database.setSavepoint() and Database.rollback() within a try-catch statement is the recommended approach for handling transactions that involve multiple DML operations. This allows the developer to roll back all changes if an error occurs, ensuring that partial changes are not committed to the database.
質問 # 129
A developer created an Apex class that updates an Account based on input from a Lightning web component that Is used to register an Account. The update to the Account should only be made if it has not already been registered.
What should the developer do to ensure that users do not overwrite each other's updates to the same Account if they make updates at the same time? A)
B)
C)
D)
正解：B
解説：
When multiple users are updating the same record at the same time, there is a risk of overwriting each other's changes. Salesforce provides a mechanism called 'record locking' to prevent this from happening.
Option D is correct because including FOR UPDATE in the SOQL query locks the retrieved records for the duration of the transaction. This prevents other transactions from updating the record until the current transaction is complete, which is essential for avoiding race conditions where two users might overwrite each other's updates.
Option A is incorrect because while adding a try/catch block around the update operation is good practice for handling exceptions, it does not prevent overwrites from concurrent updates.
Option B is incorrect because using upsert instead of update does not address the problem of concurrent updates. The upsert operation is used to either insert a new record or update an existing one based on whether a record with a matching ID or external ID already exists.
Option C is incorrect because FOR UPDATE should be used in the SOQL query to lock the records, not in the SELECT statement itself.
Salesforce Developer Documentation on Locking Statements: Locking Statements Salesforce Developer Blog on Handling Concurrency in Apex: Handling Concurrency in Apex
質問 # 130
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P.S. TopexamがGoogle Driveで共有している無料かつ新しいPlat-Dev-301ダンプ：https://drive.google.com/open?id=16byfoI9WqkKH0vfj_XUiV6K4fsyS_6yE