SF-PD2 Practice Test 2 — 10 Questions

Question 1

A developer is writing a complex asynchronous batch Apex job that processes millions of financial transaction records. The job needs to maintain running totals across batches and update a summary logging record upon completion. Which mechanism allows state to be accurately preserved across individual executeBatch transactions?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Implement the Database.Stateful interface on the batch class definition to preserve instance member variable states across transaction chunks.. Implementing the Database.Stateful interface in a Batch Apex class ensures that instance member variables retain their values across distinct transaction chunks. Without this interface, member variables reset between execute method invocations. Preserving state is essential for maintaining running totals and aggregate metrics during large-scale data processing.

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Declare instance member variables inside the batch class without implementing any special interfaces.

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Store running totals inside static variables within the batch class, relying on the Apex transaction cache.

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Write running totals to a custom metadata type record inside each execute method iteration.

Question 2

Refer to the exhibit. The Apex transaction is consistently hitting the CPU limit. What is the most likely cause and the best way to optimize the code?

Accepted Answer

Replace nested loops with Map-based lookups.. The CPU time limit is reached when the Apex code performs too many calculations, loops, or complex logic within a single transaction. Optimization requires reducing the complexity of the code, such as moving away from nested loops, using maps for faster lookups, or offloading heavy computations to asynchronous processes like Batch Apex or Queueable Apex. This ensures that the transaction completes within the time limit allocated by the platform.

Answer

Reduce the batch size in the Batch Apex class.

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Increase the CPU limit in the organization configuration.

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Use the 'transient' keyword for all variables.

Question 3

An enterprise Salesforce application requires high-performance execution of complex SOQL queries across millions of records. Which strategy should a developer implement to ensure optimal query performance and prevent governor limit violations?

Accepted Answer

Apply custom indexes on frequently filtered fields and ensure filters use selective criteria.. Utilizing selective queries with custom indexes combined with proper bind variables ensures that database operations avoid full table scans. This optimization directly prevents CPU time and query row limit exceptions, protecting platform resources and maintaining user experience under heavy transaction loads.

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Write dynamic SOQL strings concatenating user inputs to filter datasets flexibly.

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Retrieve all records into an Apex collection and filter them using nested loops.

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Wrap every SOQL query in a try-catch block to automatically fallback to unindexed searches.

Question 4

A developer is attempting to debug a failed deployment in a sandbox. The error message is cryptic, and the debug logs are not capturing the expected execution flow. What should the developer do first?

Accepted Answer

Increase the debug log level for the user executing the deployment.. Effective debugging starts with ensuring the logging level is correctly configured. If logs are not capturing the flow, it is likely the log level for 'Apex Code' or 'Apex Profiling' is set to 'None' or 'Error'. Increasing the verbosity to 'Fine' or 'Finest' is the standard procedure to gain visibility into the execution path, allowing for the identification of logic errors or incorrect configuration.

Answer

Delete the Apex class and re-deploy it.

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Refresh the sandbox to clear any corrupted metadata.

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Open a Salesforce support ticket immediately.

Question 5

A developer wants to minimize the impact of long-running operations on the user interface. Which design pattern should they utilize?

Accepted Answer

Use Queueable Apex to offload complex tasks to the background.. Asynchronous processing, such as Queueable Apex, offloads heavy tasks to the background. By executing long-running logic outside the main user request thread, the UI remains responsive. This improves the perceived performance of the application significantly, as users do not have to wait for complex computations to finish before continuing their work in the Salesforce interface.

Answer

Implement @future methods for every database update.

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Use Platform Events to perform synchronous calculations.

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Write the logic in JavaScript to execute on the client side.

Question 6

Refer to the exhibit. The service is failing because the external system requires a specific 'Content-Type' header that is missing. Which addition to the code will correctly resolve this issue?

Accepted Answer

req.setHeader('Content-Type', 'application/json');. To successfully communicate with an external API that expects specific metadata, the HTTP request must be configured with the necessary headers before the request is sent. The HttpRequest class provides the setHeader() method, which is the standard way to define metadata such as 'Content-Type' or 'Authorization'. Adding this line ensures the request is formatted correctly for the external system's expectations.

Answer

req.setBody('Content-Type: application/json');

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req.setMethod('Content-Type: application/json');

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h.setHeader('Content-Type', 'application/json');

Question 7

A developer is writing a query to fetch related records. Which SOQL pattern is best for avoiding unnecessary query execution and improving performance?

Accepted Answer

Use a single relationship query to fetch parent and child records.. Using relationship queries (joins) allows fetching data from parent and child objects in a single SOQL statement. This prevents the 'query-in-a-loop' anti-pattern, which is the most common cause of hitting the 100 SOQL query limit. By retrieving all necessary data at once, the developer reduces the number of server round-trips and keeps the transaction lightweight and performant, which is essential for scaling code in an enterprise environment.

Answer

Perform separate queries for each record inside a loop.

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Cache all retrieved data in a static Map variable.

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Use the 'FOR' loop with the 'LIMIT' keyword.

Question 8

A company requires that an integration log all outbound API requests for auditing purposes, including the full request and response body. Given the potential for high volumes, which implementation is most efficient and compliant?

Accepted Answer

Use Platform Events to log the data asynchronously in a separate transaction.. Using a Platform Event to log integration data is the most efficient pattern. Because the logging happens asynchronously, it doesn't block the main business transaction. By publishing an event, a separate subscriber can handle the heavy lifting of storing the log in a custom object, ensuring the primary business operation remains performant while maintaining an audit trail for all outbound communications.

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Insert a record into a custom 'Log' object synchronously within the integration class.

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Store the logs in a static variable and write to the database at the end of the day.

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Write the logs to the Debug Log and parse them later using a log monitoring tool.

Question 9

An enterprise development team uses Salesforce DX scratch orgs for feature development. A developer needs to ensure that unit tests execute automatically every time code is committed to the version control system. Which integration approach achieves this requirement?

Accepted Answer

Set up a CI/CD pipeline using GitHub Actions or Jenkins to spin up a scratch org, push metadata, and run sf apex test run.. Integrating CI/CD pipelines with version control hooks automates validation processes. Utilizing Salesforce CLI commands within CI runners guarantees that code meets quality gates and test coverage thresholds before merging into shared branches, protecting code health and reducing integration debt across large distributed development teams.

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Configure a scheduled Apex job in the scratch org to run all tests nightly and email logs to the engineering team.

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Rely on developers to manually execute unit tests in their local IDE terminals before pushing commits to remote branches.

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Configure a change set deployment validation rule that triggers whenever a pull request is opened in GitHub.

Question 10

A developer is building a Lightning Web Component for a Lightning Experience app. The component contains a form with an <input> for a search term and a list of results. When the user types into the input, the component must call an Apex method that returns matching records. The developer observes that the Apex method is being invoked on every keystroke, causing excessive server calls. Which technique should the developer use to limit the number of Apex calls while still updating the results as the user types?

Accepted Answer

Implement a debounce function using setTimeout and clearTimeout to delay the Apex call until the user pauses typing.. Debouncing is the correct technique to limit Apex calls triggered by rapid user input. By delaying the call until the user pauses typing, the component reduces server load while still providing timely results. Other options either do not control timing or do not effectively reduce the number of calls in this scenario.

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Set the Apex method to cacheable=true and call it imperatively from the component's JavaScript.

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Use the lightning-input component with the onchange event and call the Apex method only when the input value length exceeds three characters.

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Use the @wire decorator with the Apex method and pass the search term as a reactive parameter.