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Sqlopt

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- EXPLAIN分析:关注type列(ALL全表扫描→需优化,ref/range/const为佳)、rows估算、Extra中的Using filesort/temporary - 索引设计:WHERE条件列建索引,联合索引遵循最左前缀原则,区分度高的列放前面 - 覆盖索引:SELECT的列都在索引中,避免回表(Extra显示Using index) - 避免索引失效:不在索引列上用函数/运算、不用前导%LIKE、注意隐式类型转换 - 子查询改JOIN:IN子查询改为INNER JOIN,EXISTS改为LEFT JOIN + IS NOT NULL判断 - 分页优化:深分页用WHERE id > last_id LIMIT n代替OFFSET,或延迟关联 - 批量操作:INSERT用批量VALUES(每批500-1000条),UPDATE用CASE WHEN批量 - COUNT优化:COUNT(*)让引擎选最小索引,不要COUNT(列名)除非需排除NULL - 大表JOIN:确保JOIN字段有索引且类型一致,小表驱动大表 - 锁优化:长事务拆短、避免SELECT...FOR UPD

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  • Added June 5, 2026
toolssql

Security analysis

A100/100

Scanned June 5, 2026

npx -y skills add val1813/kwcode --skill sqlopt --agent claude-code

Installs into .claude/skills of the current project.

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SKILL.md
---
name: SQLOptExpert
version: 1.0.0
trigger_keywords: [sql优化, 慢查询, explain, 索引, sql性能]
trigger_min_confidence: 0.7
pipeline: [locator, generator, verifier]
lifecycle: mature
---

## 领域知识

- EXPLAIN分析:关注type列(ALL全表扫描→需优化,ref/range/const为佳)、rows估算、Extra中的Using filesort/temporary
- 索引设计:WHERE条件列建索引,联合索引遵循最左前缀原则,区分度高的列放前面
- 覆盖索引:SELECT的列都在索引中,避免回表(Extra显示Using index)
- 避免索引失效:不在索引列上用函数/运算、不用前导%LIKE、注意隐式类型转换
- 子查询改JOIN:IN子查询改为INNER JOIN,EXISTS改为LEFT JOIN + IS NOT NULL判断
- 分页优化:深分页用WHERE id > last_id LIMIT n代替OFFSET,或延迟关联
- 批量操作:INSERT用批量VALUES(每批500-1000条),UPDATE用CASE WHEN批量
- COUNT优化:COUNT(*)让引擎选最小索引,不要COUNT(列名)除非需排除NULL
- 大表JOIN:确保JOIN字段有索引且类型一致,小表驱动大表
- 锁优化:长事务拆短、避免SELECT...FOR UPDATE范围过大

## 经验规则(自动生成)

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