Does it modify my database directly?

The skill generates optimized SQL scripts and CREATE INDEX statements for you to review and test. It uses bash tools to run EXPLAIN ANALYZE to verify performance without making permanent schema changes unless directed.

Can it help with slow JOIN operations?

Yes, it analyzes JOIN ordering, suggests replacing correlated subqueries with JOINs or EXISTS, and identifies where lateral joins or window functions would be more efficient than self-joins.

Can it handle complex window functions?

Absolutely. It is designed to replace expensive subqueries and self-joins with window functions like ROW_NUMBER(), RANK(), and Lead/Lag for better performance and readability.

How does it verify performance improvements?

It performs a comparative analysis of before-and-after execution plans, specifically looking for reductions in total execution time, rows scanned, and disk/buffer I/O.

Which databases does this skill support?

The skill provides specific optimization patterns and CLI support for PostgreSQL and MySQL, including support for their respective EXPLAIN formats and specific dialect optimizations.

SQL Query Optimizer

Name: SQL Query Optimizer
Author: micsapp

bymicsapp

0•

データベース管理

Optimizes database performance by analyzing execution plans and rewriting SQL queries to eliminate anti-patterns and improve speed.

The SQL Query Optimizer skill empowers Claude Code to act as a database performance engineer, transforming slow queries into high-performance SQL. By analyzing execution plans from PostgreSQL and MySQL, it identifies critical bottlenecks such as unnecessary sequential scans, inefficient JOINs, and suboptimal subqueries. The skill provides automated rewrites using modern SQL features like window functions and lateral joins, generates precise index recommendations, and validates improvements with measurable performance metrics, making it an essential tool for developers troubleshooting database latency and high I/O overhead.

主な機能

01Strategic index recommendations based on query predicates and data distribution.

02Comprehensive execution plan analysis for PostgreSQL and MySQL databases.

03Advanced query restructuring using window functions, CTEs, and lateral joins.

04Automated SQL rewriting to eliminate anti-patterns like SELECT * and inefficient subqueries.

05Performance benchmarking providing before-and-after metrics comparisons for execution time and buffer usage.

060 GitHub stars

ユースケース

01Modernizing legacy SQL code to utilize high-performance modern database features.

02Diagnosing and resolving latency in slow-running production database queries.

03Reducing server load by optimizing resource-intensive aggregation and reporting queries.

主な機能

01Strategic index recommendations based on query predicates and data distribution.

02Comprehensive execution plan analysis for PostgreSQL and MySQL databases.

03Advanced query restructuring using window functions, CTEs, and lateral joins.

04Automated SQL rewriting to eliminate anti-patterns like SELECT * and inefficient subqueries.

05Performance benchmarking providing before-and-after metrics comparisons for execution time and buffer usage.

060 GitHub stars

ユースケース

01Modernizing legacy SQL code to utilize high-performance modern database features.

02Diagnosing and resolving latency in slow-running production database queries.

03Reducing server load by optimizing resource-intensive aggregation and reporting queries.