[Solved] How do multiple indexes on a table affect the performance of INSERT and UPDATE operations? — Ans: Each index must be updated, increasing the time required for the operation | SQL

SQL - Indexes and Query Performance

How do multiple indexes on a table affect the performance of INSERT and UPDATE operations?

AEach index must be updated, increasing the time required for the operation

BIndexes improve <code>INSERT</code> and <code>UPDATE</code> speed by caching data

CIndexes have no effect on <code>INSERT</code> and <code>UPDATE</code> performance

DIndexes only affect <code>SELECT</code> queries and not data modification statements

Step-by-Step Solution

Solution:

Step 1: Understand index maintenance
When a row is inserted or updated, all indexes on the table must be updated to reflect the change.
Step 2: Impact on performance
This additional work increases the time taken for INSERT and UPDATE operations, especially if many indexes exist.
Final Answer:
Each index must be updated, increasing the time required for the operation -> Option A
Quick Check:
Indexes slow down writes due to maintenance overhead [OK]

Quick Trick: More indexes mean more overhead on writes [OK]

Common Mistakes:

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