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A developer reports that after inserting many rows, the BRIN index is not improving query speed. What should you check?

medium📝 Debug Q7 of 15
PostgreSQL - Indexing Strategies
A developer reports that after inserting many rows, the BRIN index is not improving query speed. What should you check?
AWhether the table has been vacuumed or analyzed recently.
BIf the BRIN index was created with the wrong column name.
CIf the BRIN index is automatically updated after inserts.
DIf the table has a primary key defined.
Step-by-Step Solution
Solution:

  1. Step 1: Understand BRIN index maintenance

    BRIN indexes rely on block summaries updated during vacuum or analyze operations.

  2. Step 2: Identify maintenance impact

    If vacuum/analyze hasn't run, BRIN summaries may be outdated, reducing query speed benefits.

  3. Final Answer:

    Whether the table has been vacuumed or analyzed recently. -> Option A

  4. Quick Check:

    BRIN needs vacuum/analyze for accurate summaries [OK]
Quick Trick: Run vacuum/analyze to keep BRIN index effective [OK]
Common Mistakes:
  • Assuming BRIN updates instantly after inserts
  • Ignoring maintenance commands
  • Focusing on primary key presence

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