Salesforce Salesforce Certified Platform Developer II ( Plat-Dev-301 ) PDII Exam Dumps: Updated Questions & Answers (January 2026)

When a Visualforce page is slow because it attempts to load a massive dataset all at once, the bottleneck is often the time taken by the controller constructor to query and process those records before the page can even begin to render. Lazy Loading (Option B) is a strategy where the developer avoids loading all data during the initial page initialization.

Instead of querying 10,000 records in the constructor, the developer can load only the structural elements of the page first. Then, using an action method (triggered by or a window.onload script), the data is fetched in the background. This allows the user to see the page layout immediately while the data "populates" shortly after. This significantly improves the Time to First Byte (TTFB) and the perceived performance of the page.

Option A (transient) is excellent for reducing the View State size and speeding up postbacks (button clicks), but it does not inherently speed up the initial load time of a large dataset. Option C (JavaScript processing) can help but doesn't solve the data retrieval bottleneck. Option D (actionPoller) is used for periodic updates and is not an efficient way to load an initial large dataset. Lazy loading ensures that the "heavy lifting" is decoupled from the initial page load, providing a more responsive experience.

Comprehensive and Detailed 150 to 14250 words of Explanation:

Jest tests for Lightning Web Components (LWC) run in a virtual browser environment called JSDOM. In this environment, the document.body persists across individual test cases (it or test blocks) within a single test file. If a developer mounts a component to the DOM in the first test and doesn't remove it, the component's state and DOM elements will still be present when the second test starts, leading to "leaked" data and unreliable test results.

To ensure test isolation—which is critical for testing conditional rendering—the developer must clean up the DOM after every test. The standard best practice is to use the afterEach() hook (Option D). Within this hook, the developer should execute a loop that removes all child elements from document.body. This ensures that each test begins with a completely "clean slate."

Option A is too vague; "teardown block" is a general term, but afterEach() is the specific Jest implementation. Option B is for organizing tests but doesn't handle DOM cleanup. Option C is unnecessary as the LWC testing utility manages the JSDOM instance. By using afterEach() to reset the DOM, the developer can accurately verify that the component correctly shows or hides child components based on the specific inputs provided in each individual test case.

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Loading "thousands" of records at once into a Visualforce page causes performance issues primarily due to the heavy DOM processing required to render thousands of table rows and the large View State generated.

The most effective way to improve performance and user experience in this scenario is pagination. Instead of rendering all records simultaneously, pagination displays a subset (e.g., 20 records) at a time. Using the StandardSetController (which is implied by "standard Account List controller" in the context of lists) allows for efficient server-side pagination. It queries and retrieves only the records needed for the current page view, drastically reducing the View State size and the DOM elements the browser must render. While JavaScript Remoting (Option D) is fast for data retrieval, pagination is the fundamental pattern required to solve the "render time" issue for large lists.

When an external application needs to request data from Salesforce, you must expose an endpoint. Since the requirement specifically mentions JSON format and a native mobile app (iOS), an Apex REST web service (Option D) is the optimal choice. REST (Representational State Transfer) is the industry-standard architecture for mobile-to-cloud integrations because it is lightweight, uses standard HTTP methods, and natively supports JSON.

By using the @RestResource and @HttpGet annotations in an Apex class, a developer can create a custom endpoint that performs complex logic, such as querying multiple objects (Accounts, Orders, Line Items), and returns a single, consolidated JSON response. This is far more efficient than the standard REST API if the mobile app would otherwise need to make multiple sequential calls to gather the same information.

Options B and C are incorrect because "callouts" are used when Salesforce requests data from an external system, not the other way around. Option A (SOAP) is a heavier, XML-based protocol that is less efficient for mobile development and does not use the JSON format natively. Therefore, a custom Apex REST service provides the best performance and flexibility for mobile integrations.

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Visualforce provides two primary ways to perform AJAX-style operations: JavaScript Remoting and Remote Objects. The primary benefit of JavaScript Remoting (Option A) is its ability to execute complex server-side logic.

JavaScript Remoting works by calling an Apex method annotated with @RemoteAction. Because this is a standard Apex method, it can perform advanced calculations, complex SOQL queries with multi-object joins, DML operations across various objects, and even call out to external web services.

In contrast, Remote Objects are purely declarative. They allow you to perform basic CRUD operations (Create, Read, Update, Delete) on a single object directly from JavaScript without writing any Apex. While Remote Objects are easier to set up for simple data entry, they cannot handle "business logic" (like calculating a discount based on customer history) during the data retrieval process.

Option B and C describe Remote Objects, not Remoting. Option D is a feature of standard Visualforce tags like , but not a specific differentiator for Remoting. Therefore, when your application needs "brains" on the server, JavaScript Remoting is the superior choice.

Co30mprehensive and Detailed 150 to 250 words of Explanation:

When retrieving data for display in a custom UI, formatting dates, times, and currencies to match the user's specific locale can be complex. Salesforce provides the FORMAT() function within SOQL specifically to handle this at the database layer.

When you wrap a field in the FORMAT() function, such as SELECT FORMAT(Amount), FORMAT(LastModifiedDate) FROM Opportunity, the platform automatically applies the localized formatting rules based on the user's "Language and Locale" settings. This includes applying the correct currency symbol, thousands separators, decimal points, and date/time structures (e.g., MM/DD/YYYY vs DD/MM/YYYY). For organizations with Multi-Currency enabled, FORMAT() also handles the conversion and display of currency symbols according to the record's currency code.

Using FORMAT() is significantly more efficient than creating a wrapper class (Option B) or using REGEX (Option C), as it leverages the platform's native globalization engine. Option D (FOR VIEW) is used to update the "Last Viewed" date and does not affect the visual formatting of the returned data. By using FORMAT(), the developer ensures that the Lightning component remains lightweight and consistent with the standard Salesforce user experience.

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When managing integrations where endpoints (URLs) or authentication details are subject to change, Named Credentials (Option A) provide the most maintainable and secure solution. A Named Credential specifies the URL of a callout endpoint and its required authentication parameters in one definition. By referencing a Named Credential in Apex code (e.g., callout:MyExternalSystem/path), the developer abstracts the literal URL away fro1m the code itself.

If the URL changes, an administrator can simply update the Named Credential record in the Setup menu without requiring a code deployment or a change to the Apex class. Additionally, Named Credentials automatically handle the callout overhead for Remote Site Settings; you do not need to maintain a separate entry in Remote Site Settings if a Named Credential is used.

Connected Apps (Option B) are used to allow external applications to connect into Salesforce, not for making outbound callouts. Session IDs (Option D) are authentication tokens and do not manage endpoint URLs. By utilizing Named Credentials, developers ensure that their integration logic remains decoupled from environment-specific configurations, facilitating smoother transitions between sandboxes and production environments.

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In Salesforce Apex, each DML statement is its own mini-transaction unless specific measures are taken to group them. If a developer performs an insert parent; followed by an insert child;, and the child insertion fails due to a validation rule, the parent record remains in the database. This leads to "orphaned" parent records, violating the bu17siness requireme18nt that every parent must have a child.

To ensure "all-or-nothing" behavior across multiple DML statements, the developer should use Database.setSavepoint() and Database.rollback(). By setting a savepoint before the parent is inserted, the developer creates a "marker" for the database state. If the child insertion fails and throws an exception, the code enters the catch block. Within the catch block, the developer can call Database.rollback(sp), which reverts the database to the state before the parent was ever inserted. This ensures that either both records are created successfully or neither is created.

Option A is incorrect because allOrNone only applies to the records within a single Database.insert() call; it cannot link the success of two separate DML calls for different objects. Option B is a manual cleanup approach that is less reliable than a system-level rollback. Option D is typically used in triggers to prevent saving, but it doesn't provide the transactional control needed in a custom method with multiple DML steps. Using savepoints is the standard best practice for managing multi-object transaction atomicity.

The most effective way to optimize test performance when multiple test methods require the same set of records is to use the @testSetup annotation (Option C).

When a method is marked with @testSetup, Salesforce executes it exactly once before any test methods in the class run. The platform then creates a "database snapshot" of those records. For every individual test method in the class, Salesforce simply rolls back the database to that snapshot rather than re-executing the DML operations required to create the records. This dramatically reduces the total number of DML statements and CPU time consumed during the test run.

In contrast, calling a TestDataFactory (Option D) from within every test method results in the same records being inserted and deleted repeatedly for every test case. If a class has 50 test methods, the records are created 50 times. With @testSetup, they are created once. Option A is not possible (you cannot programmatically disable these during a test run), and Option B is incorrect as test classes do not use constructors in this manner. Using @testSetup is the platform-recommended pattern for efficient, high-performance unit testing.

In Salesforce, a critical restriction is that synchronous callouts cannot be made from within an Apex trigger. This architectural limitation is in place because triggers execute as part of a database transaction. Allowing a synchronous callout—which waits for a response from an external system—would keep the database connection and transaction locks open for an indeterminate amount of time. This could lead to severe performance bottlenecks and row-locking issues across the entire organization. Therefore, if a developer needs to initiate an external integration based on a record change (trigger), the logic must be handed off to an asynchronous process, such as a @future(callout=true) method, a Queueable class, or a Platform Event.

Regarding the other options: A callout that takes longer than the maximum timeout (120 seconds) will fail regardless of whether it is synchronous or asynchronous, though async is often preferred for longer-running tasks to avoid blocking the user UI. Salesforce allows up to 100 callouts in a single transaction, so making more than 10 (Option C) does not inherently force an asynchronous approach unless the 100-callout limit is exceeded. Finally, the use of the REST API (Option D) is simply a protocol choice and does not dictate the execution context. Consequently, the presence of an Apex trigger is the only scenario listed that programmatically mandates the use of asynchronous execution to perform a callout.