After adding several indexes to a PostgreSQL table, a developer observes that UPDATE statements are running slower than before. What is the most probable cause?

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PostgreSQL - Indexing Strategies

AIndexes cause deadlocks that delay UPDATE queries

BPostgreSQL automatically disables indexes during UPDATE operations

CThe table's data pages become fragmented, causing slower disk reads

DEach UPDATE must also modify all related indexes, increasing overhead

Step-by-Step Solution

Solution:

Step 1: Understand how indexes affect write operations
Indexes must be updated whenever the indexed columns are modified, adding overhead.
Step 2: Analyze the impact on UPDATE statements
Since UPDATE changes data, all indexes on affected columns need maintenance, slowing down the operation.
Final Answer:
Each UPDATE must also modify all related indexes, increasing overhead -> Option D
Quick Check:
Indexes speed reads but slow writes due to maintenance [OK]

Quick Trick: More indexes mean slower writes due to update overhead [OK]

Common Mistakes:

Thinking indexes are disabled during updates
Assuming fragmentation is the main cause
Believing indexes cause deadlocks

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After adding several indexes to a PostgreSQL table, a developer observes that UPDATE statements are running slower than before. What is the most probable cause?

Step 1: Understand how indexes affect write operations

Step 2: Analyze the impact on UPDATE statements

Final Answer:

Quick Check:

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