PostgreSQL - Indexing Strategies
Why might a partial index with a complex
WHERE clause sometimes be less efficient than a full index?Why might a partial index with a complex WHERE clause sometimes be less efficient than a full index?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand partial index limitations
Partial indexes are only used if the query'sWHEREclause matches the index condition exactly.Step 2: Compare efficiency
If queries vary, the planner may skip the partial index, making a full index more reliable.Final Answer:
Because the query planner may not use it if the query's filters do not exactly match the partial index condition. -> Option DQuick Check:
Partial index usage depends on query match = D [OK]
Quick Trick: Partial index efficiency depends on query condition match [OK]
Common Mistakes:
- Thinking partial indexes always use more space
- Assuming higher CPU cost for partial indexes
- Believing PostgreSQL limits partial indexes by table size
Master "Indexing Strategies" in PostgreSQL
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