LWCIntermediateldswireperformancedata
Explain Lightning Data Service vs imperative Apex for record data
Real World Scenario
A record detail LWC fetches Account via Apex on every render while sibling components duplicate the same query causing load delays.
Expected Answer
• Use @wire(getRecord) for reactive cached record data shared across components
• LDS invalidates cache on record updates via notifyRecordUpdateAvailable or uiRecordApi
• Imperative Apex when LDS unsupported objects, aggregations, or complex filters needed
• Avoid duplicate wires on same record—LDS deduplicates but Apex does not
• getRecord supports layout types FULL, COMPACT for field selection efficiency
• Error handling via wire error property with user-friendly toast
• Security: LDS respects FLS and sharing automatically
Follow-Up Questions & Answers
Click to expand — each follow-up includes a direct, interview-ready answer
Main difference: use case and scale. Use @wire(getRecord) for reactive cached record data shared across components. LDS invalidates cache on record updates via notifyRecordUpdateAvailable or uiRecordApi. Pick based on your integration pattern and team capability. Default to LDS for standard object UI—Apex data layers add latency and duplicate security logic. Balance speed of delivery with maintainability.
Architect Perspective
Default to LDS for standard object UI—Apex data layers add latency and duplicate security logic.