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How does creating a single column index on a frequently updated column affect database performance?

hard📝 Application Q9 of 15
SQL - Indexes and Query Performance

How does creating a single column index on a frequently updated column affect database performance?

AIt may slow down updates because the index must be maintained
BIt speeds up updates by organizing data
CIt deletes old data automatically
DIt prevents updates on that column
Step-by-Step Solution
Solution:
  1. Step 1: Understand index maintenance during updates

    Indexes must be updated whenever the indexed column changes, adding overhead.
  2. Step 2: Analyze impact on frequently updated columns

    Frequent updates cause extra work to keep the index current, slowing update speed.
  3. Final Answer:

    It may slow down updates because the index must be maintained -> Option A
  4. Quick Check:

    Indexes slow updates due to maintenance [OK]
Quick Trick: Indexes speed reads but slow writes on updated columns [OK]
Common Mistakes:
  • Assuming indexes speed up updates
  • Thinking indexes delete data
  • Believing indexes block updates

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