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Why does PostgreSQL require statistics collection via ANALYZE for query planning?

hard📝 Conceptual Q10 of 15
PostgreSQL - Performance Tuning
Why does PostgreSQL require statistics collection via ANALYZE for query planning?
ATo lock tables during queries
BTo estimate data distribution and choose efficient query plans
CTo backup data before queries
DTo automatically create indexes
Step-by-Step Solution
Solution:

  1. Step 1: Understand role of statistics in query planning

    Statistics help the planner estimate row counts and data distribution to pick efficient plans.

  2. Step 2: Check other options

    Locking, backup, and index creation are unrelated to ANALYZE's purpose.

  3. Final Answer:

    To estimate data distribution and choose efficient query plans -> Option B

  4. Quick Check:

    ANALYZE helps planner estimate data for queries [OK]
Quick Trick: ANALYZE helps planner estimate data for better queries [OK]
Common Mistakes:
  • Confusing ANALYZE with locking
  • Thinking ANALYZE backs up data
  • Assuming ANALYZE creates indexes

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