[Solved] How can combining EXPLAIN with index creation improve query performance in a large database? — Ans: EXPLAIN shows missing indexes; creating them speeds up data access | SQL

SQL - Indexes and Query Performance

How can combining EXPLAIN with index creation improve query performance in a large database?

AEXPLAIN automatically creates indexes for slow queries

BEXPLAIN shows missing indexes; creating them speeds up data access

CIndexes slow down queries, so EXPLAIN suggests removing them

DEXPLAIN replaces the need for indexes entirely

Step-by-Step Solution

Solution:

Step 1: Use EXPLAIN to identify slow parts
EXPLAIN shows where full scans happen due to missing indexes.
Step 2: Create indexes to improve those parts
Adding indexes speeds up data retrieval for those queries.
Final Answer:
EXPLAIN shows missing indexes; creating them speeds up data access -> Option B
Quick Check:
EXPLAIN + indexes = faster queries [OK]

Quick Trick: Use EXPLAIN to find missing indexes to add [OK]

Common Mistakes:

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How can combining EXPLAIN with index creation improve query performance in a large database?