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---
name: sql-performance
description: Optimize SQL query runtime with EXPLAIN, indexes and execution plans. SQL 성능 느린 쿼리 실행계획 인덱스 최적화.
---
Read the execution plan and representative cardinalities, identify expensive scans or joins, propose a measurable index or query rewrite, and compare runtime. Preserve semantics. Do not diagnose wrong business results as a performance task.
