SALESFORCE-PD1 User Interface Practice Question
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?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use server-side pagination passing page offset and limit parameters to the Apex controller.
Implementing server-side pagination with OFFSET and LIMIT or using standard database query locators in Apex is best practice.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Fetch all records in a single transaction and slice the array in JavaScript.
Why it's wrong here
Incorrect because fetching all records can cause heap size limits and performance degradation.
- ✗
Store the entire dataset in browser local storage for client-side manipulation.
Why it's wrong here
Incorrect because local storage has strict quota limits and security implications.
- ✗
Use the @wire decorator with an unbounded query and enable auto-caching.
Why it's wrong here
Incorrect because unbounded queries still pull all records into memory.
- ✓
Use server-side pagination passing page offset and limit parameters to the Apex controller.
Why this is correct
Correct because server-side pagination limits governor limits and data transfer.
About these practice questions
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
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