[Solved] Why does PostgreSQL use indexes to improve query performance? — Ans: Indexes allow faster data retrieval by reducing the number of rows scanned | PostgreSQL

PostgreSQL - Indexing Strategies

Why does PostgreSQL use indexes to improve query performance?

AIndexes prevent all types of database errors

BIndexes allow faster data retrieval by reducing the number of rows scanned

CIndexes automatically fix data inconsistencies

DIndexes increase the size of the database without any performance benefit

Step-by-Step Solution

Solution:

Step 1: Understand the purpose of indexes in databases
Indexes are data structures that help the database find rows faster without scanning the entire table.
Step 2: Relate indexes to query performance
By using indexes, PostgreSQL can quickly locate the needed rows, reducing query time significantly.
Final Answer:
Indexes allow faster data retrieval by reducing the number of rows scanned -> Option B
Quick Check:
Index purpose = Faster data retrieval [OK]

Quick Trick: Indexes speed up searches by avoiding full table scans [OK]

Common Mistakes:

Master "Indexing Strategies" in PostgreSQL

9 interactive learning modes - each teaches the same concept differently

Why does PostgreSQL use indexes to improve query performance?