schema-primary-keys

Primary key choice affects insert performance, index size, and replication efficiency.

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/schema-primary-keys && curl -fsSL https://doutorai.pt/data/lib/skills__schema-primary-keys.md -o .claude/skills/schema-primary-keys/SKILL.md

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

Content

---
title: Select Optimal Primary Key Strategy
impact: HIGH
impactDescription: Better index locality, reduced fragmentation
tags: primary-key, identity, uuid, serial, schema
---

## Select Optimal Primary Key Strategy

Primary key choice affects insert performance, index size, and replication
efficiency.

**Incorrect (problematic PK choices):**

```sql
-- identity is the SQL-standard approach
create table users (
  id serial primary key  -- Works, but IDENTITY is recommended
);

-- Random UUIDs (v4) cause index fragmentation
create table orders (
  id uuid default gen_random_uuid() primary key

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