query-index-types

Different index types excel at different query patterns. The default B-tree isn't always optimal.

Skills
Databases
0

What it does and how to use it

A skill that teaches Claude Code to do databases tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
In Claude Code, describe what you need - the skill turns on by itself when the context fits.
No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/query-index-types && curl -fsSL https://doutorai.pt/data/lib/skills__query-index-types.md -o .claude/skills/query-index-types/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

---
title: Choose the Right Index Type for Your Data
impact: HIGH
impactDescription: 10-100x improvement with correct index type
tags: indexes, btree, gin, brin, hash, index-types
---

## Choose the Right Index Type for Your Data

Different index types excel at different query patterns. The default B-tree isn't always optimal.

**Incorrect (B-tree for JSONB containment):**

```sql
-- B-tree cannot optimize containment operators
create index products_attrs_idx on products (attributes);
select * from products where attributes @> '{"color": "red"}';
-- Full table scan - B-tree doesn't support @> 

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