59 / 81 · Module 16 — Production Engineering and Observability · filtered: interview← prev⊞ allnext →
16.53When caching helps
Suppose:
GET customer reference information
rarely changes but gets queried constantly.
Possible:
cache
to reduce Salesforce calls.
But ask:
How stale may data be?
How invalidate cache?
What happens after update?
Is Salesforce still source of truth?
Caching trades freshness for performance/capacity.