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A system uses caching but users report outdated data. What is a likely cause?

medium📝 Analysis Q6 of 15
LLD - Advanced LLD Concepts
A system uses caching but users report outdated data. What is a likely cause?
ALoad balancer is not distributing traffic
BDatabase is down
CCache is not invalidated after data changes
DClients are sending wrong requests
Step-by-Step Solution
Solution:

  1. Step 1: Identify caching issue

    If cache is not refreshed or invalidated, it serves old data.

  2. Step 2: Rule out other causes

    Load balancer or database issues cause different symptoms, not stale data.

  3. Final Answer:

    Cache is not invalidated after data changes -> Option C

  4. Quick Check:

    Stale data = Cache invalidation problem [OK]
Quick Trick: Always invalidate cache after data updates [OK]
Common Mistakes:
  • Blaming load balancer for stale data
  • Assuming database down causes stale data
  • Thinking client requests cause outdated info

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