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You want to cache a complex queryset result in Django for 5 minutes. Which approach is best to ensure performance and data freshness?

hard📝 Application Q8 of 15
Django - Caching
You want to cache a complex queryset result in Django for 5 minutes. Which approach is best to ensure performance and data freshness?
ACache only the SQL query string
BCache the queryset object directly without timeout
CSerialize queryset to list, cache it with 300 seconds timeout
DDo not cache querysets, always query database
Step-by-Step Solution
Solution:

  1. Step 1: Understand caching querysets

    Querysets are lazy and not serializable; caching raw queryset causes errors.

  2. Step 2: Choose serialization and timeout

    Convert queryset to list to serialize, cache with timeout to keep data fresh.

  3. Final Answer:

    Serialize queryset to list, cache it with 300 seconds timeout -> Option C

  4. Quick Check:

    Serialize queryset + timeout = best caching [OK]
Quick Trick: Cache serialized data with timeout for freshness [OK]
Common Mistakes:
MISTAKES
  • Caching queryset object directly
  • Caching SQL string which is not data
  • Avoiding caching altogether

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