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Why might caching sometimes cause stale data issues in a Django application?

hard📝 Conceptual Q10 of 15
Django - Caching
Why might caching sometimes cause stale data issues in a Django application?
ABecause cached data may not update immediately after database changes
BBecause caching deletes all data after every request
CBecause caching forces database queries every time
DBecause caching only works with static files
Step-by-Step Solution
Solution:

  1. Step 1: Understand cache data lifecycle

    Cached data stays until timeout or manual invalidation, so it may be outdated.

  2. Step 2: Identify cause of stale data

    Database changes do not instantly update cache, causing stale data until refresh.

  3. Final Answer:

    Because cached data may not update immediately after database changes -> Option A

  4. Quick Check:

    Stale data = delayed cache update [OK]
Quick Trick: Cache may hold old data until refreshed or expired [OK]
Common Mistakes:
MISTAKES
  • Thinking cache deletes data every request
  • Believing caching forces queries every time
  • Assuming caching only works with static files

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