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Why might LimitOffsetPagination be less efficient than CursorPagination on large datasets?

hard📝 Conceptual Q10 of 15
Django - DRF Advanced Features
Why might LimitOffsetPagination be less efficient than CursorPagination on large datasets?
ABecause it uses OFFSET which requires scanning rows before the offset
BBecause it encodes cursors which are slow to decode
CBecause it requires page numbers to be sequential
DBecause it caches all pages in memory
Step-by-Step Solution
Solution:

  1. Step 1: Understand LimitOffsetPagination internals

    LimitOffsetPagination uses SQL OFFSET which skips rows before the offset, causing slower queries on large offsets.

  2. Step 2: Compare with CursorPagination efficiency

    CursorPagination uses indexed fields to jump directly to the position, avoiding scanning skipped rows.

  3. Final Answer:

    Because it uses OFFSET which requires scanning rows before the offset -> Option A

  4. Quick Check:

    OFFSET causes inefficiency on large datasets [OK]
Quick Trick: OFFSET scans skipped rows; cursors jump directly [OK]
Common Mistakes:
MISTAKES
  • Thinking cursor decoding is slow
  • Assuming page numbers cause inefficiency
  • Believing pagination caches all data

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