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SQL , Database Interview

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Question:

What are the potential downsides of using too many indexes on a table?

Author: Lock Huynh



Answer:

Slower Write Operations: Every INSERT, UPDATE, or DELETE operation requires updating all relevant indexes, which can significantly slow down these write operations. Increased Storage Requirements: Each index takes up additional disk space, which can lead to increased storage costs, especially with large datasets. Index Maintenance: More indexes mean more overhead for the database engine to maintain and optimize, potentially leading to longer maintenance windows and higher resource consumption. Query Performance Degradation: Having too many indexes can sometimes confuse the query optimizer, leading it to choose suboptimal execution plans, which can degrade query performance rather than improve it.


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