Query Optimization (Grade A)セキュリティテストで検証されたスキルを、Claude AIで使う。Aランクのワークフロー。遅いDBクエリを特定して修正するワークフロー。クエリが遅い時やユーザーがDBのパフォーマンスを最適化するよう要求する時は使用する。

How does the skill benchmark performance after optimization?

After applying changes, it runs EXPLAIN ANALYZE on the modified query, comparing execution times and plan details to the original to verify improvement.

Asked by Stella Papadopoulos · Dec 4, 2025

What are the main limitations of using this tool?

The skill assumes the user has knowledge of database query analysis and can make schema changes. It requires access to run EXPLAIN ANALYZE and may need code changes to implement optimizations.

Asked by Yuki Kobayashi · Oct 24, 2025

Which optimization techniques are supported by this skill?

It can add missing or partial indexes, rewrite subqueries as JOINs, filter data with WHERE clauses, replace OFFSET with cursor-based pagination, and even denormalize tables when read performance is critical.

Asked by Kenji Watanabe · Sep 30, 2025

What steps does the Query Optimization skill follow to improve slow queries?

The workflow starts with identifying the slow query, measuring its execution time and frequency. Then it runs EXPLAIN ANALYZE to analyze the query plan, spotting sequential scans, missing indexes, and unnecessary joins. Finally, it applies optimizations such as adding indexes, rewriting subqueries, or using pagination, and benchmarks the result with EXPLAIN ANALYZE again.

Asked by Grzegorz Lewandowski · Sep 8, 2025