Individual skill
sql-optimizer
Diagnose a slow SQL query and produce a concrete optimization plan. Use when asked to optimize SQL, speed up a slow query, reduce a query's cost/scan, fix a timeout, or review a query plan. Produces an analysis — the likely bottleneck, what the plan is doing wrong (full scans, bad joins, spills), the specific rewrite and index/partition changes, and the expected impact, with the optimized query.
skills/sql-optimizer/SKILL.md
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- Last checked
- Nov 12, 2026
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- License
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SKILL.mdcore · 3,783 bytes
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# SQL Optimizer Skill
A slow query almost always has a specific, findable cause — a missing index, a non-sargable predicate, a
join that explodes rows, a scan that should be a seek. This skill diagnoses it: read what the query (and
plan, if given) is actually doing, name the bottleneck, and produce a concrete rewrite plus the index /
partition / structural changes — with the expected impact, not vague "add indexes" advice.
## Required Inputs
Ask for these only if they aren't already provided:
- **The query** (and the engine — Postgres, BigQuery, Snowflake, MySQL… optimizations differ).
- **The symptom** — slow, expensive (bytes scanned), timing out, or just under review.
- **Context if available** — `EXPLAIN`/query plan, table sizes/row counts, existing indexes, partitioning/clustering.