[Solved] What is the main purpose of a Bitmap Index Scan in PostgreSQL? — Ans: To create a bitmap of matching row locations from indexes for efficient... | PostgreSQL

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:

Step 1: Understand Bitmap Index Scan role
Bitmap Index Scan creates a bitmap representing matching row positions using indexes.
Step 2: Differentiate from other scans
It does not fetch rows directly but prepares a bitmap for efficient row retrieval later.
Final Answer:
To create a bitmap of matching row locations from indexes for efficient retrieval -> Option B
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:

Master "Performance Tuning" in PostgreSQL

9 interactive learning modes - each teaches the same concept differently

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