Answer
Slow performance is often due to poor indexing, large table scans, insufficient memory, high disk I/O, or heavy locking.
Quick Answer
Common MySQL performance issues: missing indexes (causes full table scans), bad indexes (too many or low cardinality), N+1 queries from ORMs, large result sets fetched but only a few rows used (add LIMIT), SELECT * fetching unused columns, queries with functions on indexed columns (index not used), buffer pool too small (constant disk I/O), and connection overhead (use connection pooling).
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ