493 questions total · 7pages · All types, answers revealed
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A developer is writing an Aura component and needs to dynamically create a component at runtime. Which JavaScript method should be used?
Dynamically creates an Aura component.
Why this answer
$A.createComponent() is used to instantiate components dynamically in Aura client-side controllers.
An Apex trigger processes a large volume of Opportunity updates. The developer uses Database.update(opps, false) to allow partial success. How should the developer inspect the results to handle any failures?
Database.SaveResult objects hold status flags and error lists for each processed record.
Why this answer
Database methods returning partial success provide a list of Database.SaveResult objects that contain error details.
A developer needs to access a specific HTML element in a Lightning Web Component template imperatively. Which method should be called?
Queries elements within the component template.
Why this answer
this.template.querySelector() is used to query elements inside the component's shadow DOM template.
What is the primary purpose of the 'System.debug()' statement?
This is the intended function of System.debug.
Why this answer
System.debug() writes information to the debug log to help developers diagnose execution flow and variable states.
An Apex trigger needs to query related Account records for a list of newly inserted Contact records. What is the most robust way to handle the relationship query in SOQL to avoid governor limits?
This is a best practice for bulkification, avoiding queries inside loops.
Why this answer
Using a parent-to-child or child-to-parent relationship query inside a single SOQL statement executed on the Trigger.new collection prevents hitting the SOQL query governor limit.
A developer is writing a Visualforce page that uses a custom controller. The page needs to execute an action method as soon as the page loads, without requiring user interaction. Which attribute on <apex:page> should be used?
Correct because the action attribute invokes a controller method on page load.
Why this answer
The action attribute on <apex:page> executes a controller method when the page is requested.
Which tool is best for automating a process that requires UI interaction, such as a wizard screen?
Screen flows are specifically for user interaction.
Why this answer
Flows provide the Screen component for user-interactive processes.
During the Salesforce order of execution, which THREE actions occur AFTER the system executes 'after' triggers? (Choose three.)
Correct. Assignment rules execute after after-triggers.
Why this answer
After triggers run towards the end of the transaction. Subsequent steps include assignment rules, workflow rules, and database commit.
A developer has a Queueable Apex job that needs to query large volumes of data and perform updates. To optimize performance and avoid heap size limits, what is the best practice when querying records inside a Queueable Apex job?
Correct. While Batchable is better for massive datasets, SOQL for-loops are the correct tool within Queueable to manage heap size.
Why this answer
Querying records using a SOQL Query Locator inside a batch or leveraging iterable queries helps manage memory efficiently, but for Queueable jobs, querying using SOQL for loops or batching ids helps avoid heap limits.
A developer writes an Apex method that executes a SOQL query using user-supplied search parameters. How can the developer protect against SOQL injection vulnerabilities?
Bind variables safely parameterize user input, neutralizing SOQL injection risks.
Why this answer
Using bind variables in SOQL queries automatically sanitizes the input and prevents SOQL injection, unlike string concatenation.
An enterprise application requires nightly execution of an Apex class that processes records across multiple objects. Which interface must the Apex class implement?
The Schedulable interface allows classes to be run at scheduled intervals using Cron expressions.
Why this answer
To schedule an Apex job, the class must implement the Schedulable interface, specifically the execute(SchedulableContext sc) method.
A developer needs to write a unit test for a Queueable Apex class. How should the developer verify that the Queueable job executed successfully?
Test.stopTest() forces asynchronous jobs queued inside startTest() to execute before moving to subsequent lines of test code.
Why this answer
Queueable jobs executed inside Test.startTest() and Test.stopTest() run synchronously upon reaching stopTest(), allowing assertions to be checked immediately after.
Which THREE of the following are true about Apex test data setup?
This is the correct behavior for @TestSetup.
Why this answer
Data setup should use @TestSetup where possible, avoid using actual production data, and be isolated from the database.
A developer needs to execute a dynamic SOQL query where the object name and fields are determined at runtime. Which method should be used?
Database.query evaluates and executes dynamic SOQL strings.
Why this answer
Database.query() allows execution of dynamically constructed SOQL query strings.
A developer is working with a Lightning Web Component that uses the @wire decorator to provision data from an Apex method. The Apex method depends on a property that changes dynamically. How should the property be prefixed to signal reactivity to the wire service?
Correct. Prefixing a property with $ informs the wire service to re-run when the property value changes.
Why this answer
Properties passed to a @wire adapter that are reactive must be prefixed with a dollar sign ($).
A developer is writing an Apex trigger and needs to ensure proper bulkification. Which TWO practices should the developer follow to avoid governor limits? (Choose two.)
Correct. Queries and DML inside loops quickly exhaust governor limits.
Why this answer
Bulkification requires processing data in collections (lists/sets) and placing all DML and SOQL operations outside of loops.
An Apex transaction performs a DML operation, followed by a callout to an external REST API, followed by another DML operation. What exception will Salesforce throw?
Making a callout after a DML operation in the same synchronous transaction throws a CalloutException.
Why this answer
Salesforce throws a CalloutException when a DML operation has occurred before a callout in the same transaction, to prevent database locks.
Which primitive data type in Apex can represent a specific point in time, including both date and time values?
Datetime represents a combined date and time value.
Why this answer
The Datetime data type represents both a date and a time in Apex.
A developer is implementing a custom pagination mechanism in a Lightning Web Component. The component uses an Apex controller method that returns a list of records. Which technique prevents excessive heap size and improves performance when dealing with large datasets?
Correct because server-side pagination limits governor limits and data transfer.
Why this answer
Implementing server-side pagination with OFFSET and LIMIT or using standard database query locators in Apex is best practice.
A developer needs to iterate over a map of Account IDs to Account sObjects and perform processing on each value. Which loop construct is valid Apex?
Calling .values() on a map returns a List of the sObjects, which can be iterated directly.
Why this answer
Iterating over map values is done using map.values() in a for-loop: for(Account acc : myMap.values()).
Which THREE practices are considered security best practices when developing custom Visualforce pages to prevent Cross-Site Scripting (XSS)? Choose 3 answers.
Standard components escape output safely.
Why this answer
Preventing XSS in Visualforce involves escaping output, using standard components which escape by default, and encoding untrusted data.
A developer is troubleshooting a Batch Apex job that fails intermittently. Which THREE methods or properties are part of the Database.BatchableContext interface available in batch execution? (Choose three.)
Correct. getId() returns the ID of the BatchApexWorker or job.
Why this answer
Database.BatchableContext provides methods to get job IDs and batch IDs during execution.
A developer is writing an Apex method and needs to store a collection of unique email addresses while maintaining fast lookup times. Which collection should the developer choose?
Sets inherently prevent duplicate values and offer optimized lookup performance.
Why this answer
Sets in Apex store unique elements and provide efficient membership testing methods like contains().
How can you run tests for a specific namespace using the CLI?
Correct flag.
Why this answer
The CLI supports filtering tests by namespace.
A developer needs to query all Contact records, including those that have been deleted from the database via the Recycle Bin. Which SOQL clause must be added?
ALL ROWS includes deleted records currently in the Recycle Bin and archived activities.
Why this answer
ALL ROWS must be appended to a SOQL query to include records in the Recycle Bin (deleted records) and archived tasks/events.
When comparing Flow Builder decision points and Apex trigger logic, which THREE statements are valid design considerations? (Choose THREE.)
Apex offers advanced programming constructs for complex logic.
Why this answer
Flows are declarative, easier to maintain, and execute within governor limits, whereas Apex handles complex integrations and high-volume data manipulations.
A developer needs to query all Contact records, including those that have been moved to the Recycle Bin. Which SOQL keyword should be used?
ALL ROWS retrieves records from the Recycle Bin.
Why this answer
The ALL ROWS clause in SOQL allows queries to return deleted records (from the Recycle Bin) as well as archived tasks and events.
A developer needs to ensure that a Lightning Web Component can be placed on a Record Page for an Account in the Lightning App Builder. What must be configured in the component's metadata configuration file?
Correct because lightning__RecordPage enables the component for record pages.
Why this answer
The target configuration must include lightning__RecordPage and specify the appropriate object support.
A developer implemented a Queueable Apex class that performs heavy processing. During testing, the developer wants to verify whether the asynchronous job has finished executing before running dependent unit test assertions. What should the developer use?
Test.stopTest() forces asynchronous code to execute synchronously within the test context.
Why this answer
Developers use Test.startTest() and Test.stopTest() in unit tests to force all asynchronous jobs enqueued within the block to execute synchronously before proceeding.
Which TWO options represent valid ways to instantiate and populate a Set of Strings in Apex? Choose 2 options.
Sets can be instantiated empty and populated using the add method.
Why this answer
Sets can be instantiated with new Set<String>() and populated with add() or addAll().
When using the Salesforce CLI to deploy, what is the 'check-only' flag used for?
Provides a dry run.
Why this answer
It validates the deployment without committing changes to the target org.
A developer has an Aura component that needs to communicate with an unrelated Lightning Web Component located on the same Lightning page. Which feature should the developer implement?
Correct because LMS enables communication between disparate components across the DOM.
Why this answer
The Lightning Message Service (LMS) allows communication between Visualforce pages, Aura components, and Lightning Web Components across the DOM.
A developer is building a Lightning Web Component that includes user input fields. To adhere to best practices for accessibility and SLDS form styling, how should form inputs be structured?
Correct because proper form structure ensures accessibility and SLDS compliance.
Why this answer
Form elements should be wrapped in slds-form-element with proper label and input associations.
A developer needs to run a batch job that queries records and updates them. What is the default batch size if no optional batch size parameter is specified in Database.executeBatch()?
200 is the default chunk size for batch apex.
Why this answer
The default batch size for Database.executeBatch() is 200 records if not specified.
A developer is building a Lightning Web Component and needs to execute code as soon as the component is inserted into the DOM. Which lifecycle hook should be used?
This hook is executed when the component is inserted into the DOM.
Why this answer
connectedCallback() is invoked when a component is inserted into the DOM.
A developer implements a Queueable class that makes callouts and needs to test it using Test.startTest() and Test.stopTest(). When does the asynchronous queueable job execute during a unit test?
Test.stopTest() forces all asynchronous processes enqueued within the test block to run synchronously.
Why this answer
Asynchronous code executed inside Test.startTest() and Test.stopTest() runs synchronously when Test.stopTest() is called.
A developer needs to query records using SOSL in Apex. Which THREE components are syntactically required in a valid SOSL statement? (Choose three.)
RETURNING is required to define which sObjects and fields are retrieved in the search result.
Why this answer
SOSL queries require the FIND clause with search terms, the IN clause specifying search groups, and the RETURNING clause specifying objects and fields.
A developer creates a Trigger on the Account object that performs a SOQL query inside a for loop. While testing with bulk data operations, the developer encounters a governor limit exception. Which limit is most likely exceeded?
Doing a query per record in a loop violates the 100 SOQL queries per transaction governor limit.
Why this answer
Executing SOQL queries inside a loop without bulkification easily causes the total number of SOQL queries issued per transaction (100) to be exceeded.
A developer has an Apex trigger that fires on Account update. Inside the trigger, it calls a future method to update related Contact records. During testing with 150 Account records modified simultaneously, the developer receives a System.LimitException: Too many future calls. What is the cause of this exception?
Correct. Triggers processing bulk updates can easily exceed the per-transaction limit of 50 future calls.
Why this answer
Future methods cannot be called from within other asynchronous contexts or inside triggers when the trigger processes more records than the future call limit allows per transaction (e.g. max 50 future calls per transaction).
A developer is creating an Aura component that interacts with Salesforce data. Which TWO tags or features are valid in the Aura framework? (Choose TWO)
Correct because aura:iteration iterates over collections in Aura.
Why this answer
aura:attribute and aura:iteration are valid tags in Aura markup.
Which THREE factors influence deployment success?
Required for access.
Why this answer
Tests, dependencies, and profile permissions are critical.
A developer is designing an asynchronous architecture using Batch Apex. Which THREE considerations must be kept in mind regarding Batch Apex behavior? (Choose THREE.)
The concurrent batch execution limit is 5.
Why this answer
Batch apex jobs are queued in the Flex queue, can execute up to 5 concurrent jobs, and can maintain state using Stateful.
Which TWO of the following are valid deployment tools?
Valid tool.
Why this answer
Change Sets and Salesforce CLI are standard tools.
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