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What is the main purpose of a Bitmap Index Scan in PostgreSQL?

easy📝 Conceptual Q11 of 15
PostgreSQL - Performance Tuning
What is the main purpose of a Bitmap Index Scan in PostgreSQL?
ATo delete rows using bitmap operations
BTo create a bitmap of matching row locations from indexes for efficient retrieval
CTo update rows in the table based on index values
DTo directly fetch rows from the table without using indexes
Step-by-Step Solution
Solution:
  1. Step 1: Understand Bitmap Index Scan role

    Bitmap Index Scan creates a bitmap representing matching row positions using indexes.
  2. Step 2: Differentiate from other scans

    It does not fetch rows directly but prepares a bitmap for efficient row retrieval later.
  3. Final Answer:

    To create a bitmap of matching row locations from indexes for efficient retrieval -> Option B
  4. Quick Check:

    Bitmap Index Scan = bitmap of row locations [OK]
Quick Trick: Bitmap Index Scan builds a map of rows to fetch [OK]
Common Mistakes:
  • Confusing bitmap scan with direct table scan
  • Thinking bitmap scan updates or deletes rows
  • Assuming bitmap scan fetches rows immediately

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