SQL for Java Devs · interview question
Why does adding an index on a column in terms of write performance matter in practice?
Multiple choiceHardchapter-8-curatedpremiumsql-for-java-devsindexes
Answer and explanation
Correct answer
B. It decreases write performance due to additional maintenance overhead.
Why
Adding an index requires additional maintenance when data is modified (inserts, updates, deletes), which decreases write performance. The database must update the index whenever the indexed column is modified.
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