SQL Optimization Patterns
ynulihao/AgentSkillOS
Master SQL query optimization, indexing strategies, and EXPLAIN analysis to dramatically improve database performance and eliminate slow queries.
Diagnose a slow SQL query and produce a concrete optimization plan.
Install SQL Optimizer
$ npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mohitagw15856/pm-claude-skills sql-optimizer --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sql-optimizer .claude/skills/sql-optimizer && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "sql-optimizer" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/sql-optimizer into .claude/skills/sql-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sql-optimizer", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/sql-optimizerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mohitagw15856/pm-claude-skills sql-optimizer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/sql-optimizer .agents/skills/sql-optimizer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "sql-optimizer" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/sql-optimizer into .agents/skills/sql-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sql-optimizer", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mohitagw15856/pm-claude-skills sql-optimizer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/sql-optimizer .cursor/skills/sql-optimizer && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "sql-optimizer" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/sql-optimizer into .cursor/skills/sql-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sql-optimizer", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mohitagw15856/pm-claude-skills.git --path skills/sql-optimizer--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mohitagw15856/pm-claude-skills sql-optimizer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/sql-optimizer .gemini/skills/sql-optimizer && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "sql-optimizer" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/sql-optimizer into .gemini/skills/sql-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sql-optimizer", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mohitagw15856/pm-claude-skills sql-optimizerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/sql-optimizer .github/skills/sql-optimizer && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "sql-optimizer" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/sql-optimizer into .github/skills/sql-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sql-optimizer", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mohitagw15856/pm-claude-skills sql-optimizer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/sql-optimizer .opencode/skills/sql-optimizer && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "sql-optimizer" agent skill from https://github.com/mohitagw15856/pm-claude-skills/tree/main/skills/sql-optimizer into .opencode/skills/sql-optimizer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sql-optimizer", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
sql-optimizer- GitHub stars
- 1.4k
- Token cost
- ~908 tokens
- SKILL.md length
- 433 words
- Files
- 1
- Skills in repo
- 1,322
- Repo updated
- First seen
- Licence
- MIT
At a glance
Diagnose a slow SQL query and produce a concrete optimization plan.
- Asked to optimize SQL
- SKILL.md covers Required Inputs, Output Format, Quality Checks and Anti-Patterns, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Speed up a slow query
What it does
SQL Optimizer is an agent skill from mohitagw15856/pm-claude-skills. 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.
Its SKILL.md is about 910 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Databases, covering SQL and Query optimization. It works with SQL. The repository describes itself as: 1255 professional Agent Skills for Claude, ChatGPT, Gemini, Cursor & Codex — PRDs, postmortems, leases, medical bills, layoffs, go-bags, new countries. Plain markdown, MIT, in… The licence is MIT.
When your agent uses it
- Asked to optimize SQL
- Speed up a slow query
- Reduce a querys cost/scan
- Review a query plan
Example prompts
- “/sql-optimizer”
What it can do on your machine
Read from SKILL.md and the folder at commit 1cbf1f0. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
SQL Optimizer loads about 908 tokens when it runs. Until then it costs about 103 tokens; SKILL.md has 433 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from mohitagw15856/pm-claude-skills at commit 1cbf1f0, republished under its MIT licence (© mohitagw15856). 433 words, ~908 tokens.
Download SKILL.mdSave it as
.claude/skills/sql-optimizer/SKILL.md (or your agent's skills folder).- name
- sql-optimizer
- description
- 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.
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.
Output Format
SQL Optimization: [query purpose]
1. What it's doing now — read the query (and plan): the scans, joins, sorts, and where the time/cost goes. Name the primary bottleneck (don't list ten micro-tweaks — find the one that matters).
2. The problems — ranked, each with why it's slow:
- Non-sargable predicates (functions on indexed columns, leading wildcards) → can't use an index.
- Missing/`wrong index or partition pruning; full scans where a seek is possible.
- Join issues — fan-out, wrong join order, missing join keys,
SELECT *pulling everything. - Sorts/spills,
DISTINCT/GROUP BYon high-cardinality, correlated subqueries that should be joins. - Engine-specific: BigQuery/Snowflake → bytes scanned (partition/cluster pruning), not row counts.
3. The fix — the rewritten query, plus the index / partition / clustering / materialization changes. Be specific (CREATE INDEX … ON … (cols), partition on event_date).
4. Expected impact — roughly what each change buys (seek vs. scan, pruning N% of partitions, removing a sort) and how to verify (re-run EXPLAIN, compare bytes/rows).
Show full SKILL.md (168 more words)Show less
Quality Checks
- Names the single primary bottleneck, not a scattershot list
- Predicates are checked for sargability (no functions on indexed columns, no leading
%) - Index/partition recommendations are specific (exact columns), not "add an index"
- For columnar/cloud engines, addresses bytes scanned & pruning, not just row counts
- Provides the rewritten query and a way to verify the improvement
Anti-Patterns
- Do not say "add indexes" generically — name the columns and explain which predicate/join they serve
- Do not ignore the engine — Postgres index tuning and BigQuery partition pruning are different games
- Do not optimize a query that should be a model — repeated heavy logic belongs in a materialized/dbt model
- Do not wrap indexed columns in functions in the WHERE clause — it kills index usage (non-sargable)
- Do not recommend changes without an expected impact or a way to measure it
Based On
Query-optimization practice — sargability, index/partition pruning, join-order and fan-out, plan reading, columnar bytes-scanned tuning.
Example Trigger Phrases
- "Speed up a slow query."
- "Reduce a query's cost/scan."
- "Fix a timeout."
- "Review a query plan."
© mohitagw15856, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/sql-optimizer of mohitagw15856/pm-claude-skills.
Open the folder on GitHubat commit 1cbf1f0
Compare with similar skills
SQL Optimizer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| SQL Optimizer this skillmohitagw15856/pm-claude-skills | 1.4k | — | ~908 | Automated safety check: Pass | MIT | |
| SQL Optimization Patternsynulihao/AgentSkillOS | 617 | 11 repos | ~3.3k | Automated safety check: Pass | None | |
| Query Engine Designrevfactory/claude-code-harness | 120 | — | ~474 | Automated safety check: Pass | None | |
| SQL Optimization Patternssickn33/agentic-awesome-skills | 47k | 1 repos | ~566 | Automated safety check: Pass | MIT | |
| SQL Database Assistantborghei/Claude-Skills | 881 | — | ~1.5k | Automated safety check: Pass | MIT | |
| SQL Optimization InterviewerPrepLabsAI/InterviewMentor | 112 | — | ~2.1k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about SQL Optimizer
What does SQL Optimizer do?
Diagnose a slow SQL query and produce a concrete optimization plan. SQL Optimizer is an agent skill from mohitagw15856/pm-claude-skills. Diagnose a slow SQL query and produce a concrete optimization plan.
When should I use SQL Optimizer?
SQL Optimizer fits situations like: asked to optimize SQL; speed up a slow query; reduce a querys cost/scan; review a query plan.
How do I install SQL Optimizer in Claude Code?
Run `npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a claude-code`. Or copy the skill folder (skills/sql-optimizer in mohitagw15856/pm-claude-skills) into .claude/skills/sql-optimizer in your project. Claude Code loads it when a task matches its description.
How do I install SQL Optimizer in Codex?
Run `npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a codex`. Or copy the skill folder (skills/sql-optimizer in mohitagw15856/pm-claude-skills) into .agents/skills/sql-optimizer in your project. Codex loads it when a task matches its description.
Can I use SQL Optimizer in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mohitagw15856/pm-claude-skills --skill sql-optimizer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sql-optimizer, .gemini/skills/sql-optimizer, .github/skills/sql-optimizer and .opencode/skills/sql-optimizer in your project.
What does SQL Optimizer need to run?
SKILL.md names no scripts, command-line tools or credentials: SQL Optimizer is instructions for the agent only.
Does SQL Optimizer access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is SQL Optimizer safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does SQL Optimizer use?
SQL Optimizer is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does SQL Optimizer use?
About 908 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to SQL Optimizer?
Skills that share tags, products or a category with SQL Optimizer: SQL Optimization Patterns (ynulihao/AgentSkillOS, 617 stars), Query Engine Design (revfactory/claude-code-harness, 120 stars), SQL Optimization Patterns (sickn33/agentic-awesome-skills, 47k stars) and SQL Database Assistant (borghei/Claude-Skills, 881 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains SQL Optimizer?
mohitagw15856 (a GitHub user) maintains it in mohitagw15856/pm-claude-skills, which has 1,431 GitHub stars. The repository holds 1,322 skills in this directory. The repository was last updated on October 7, 2026.
Source: mohitagw15856/pm-claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.