PostgreSQL Extensions Skill

Atomic skill for essential extensions

Overview

Production-ready patterns for installing and using key PostgreSQL extensions.

Prerequisites

• PostgreSQL 16+
• Superuser or extension privileges
• Extension packages installed

Parameters

parameters:
  operation:
    type: string
    required: true
    enum: [install, configure, use]
  extension:
    type: string
    enum: [pg_stat_statements, pg_trgm, uuid_ossp, hstore, postgis]

Quick Reference

Install Extensions

CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
CREATE EXTENSION IF NOT EXISTS pg_trgm;
CREATE EXTENSION IF NOT EXISTS uuid_ossp;
CREATE EXTENSION IF NOT EXISTS hstore;

-- Check installed
SELECT extname, extversion FROM pg_extension;

pg_stat_statements

-- Top queries
SELECT query, calls, mean_exec_time
FROM pg_stat_statements
ORDER BY total_exec_time DESC LIMIT 10;

-- Reset stats
SELECT pg_stat_statements_reset();

pg_trgm (Fuzzy Search)

-- Similarity search
SELECT name, similarity(name, 'postgresql') as sim
FROM products WHERE name % 'postgresql';

-- Create trigram index
CREATE INDEX idx_trgm ON products USING GIN (name gin_trgm_ops);

uuid-ossp

SELECT uuid_generate_v4();

hstore

SELECT 'key=>value'::hstore;
SELECT data->'key' FROM table_with_hstore;

Essential Extensions

Extension	Use Case
pg_stat_statements	Query analysis
pg_trgm	Fuzzy text search
uuid-ossp	UUID generation
hstore	Key-value pairs
postgis	Geospatial data
pgcrypto	Encryption

Troubleshooting

Problem	Cause	Solution
Extension not found	Not installed	apt install postgresql-16-*
Permission denied	Not superuser	GRANT CREATE ON DATABASE
Version mismatch	Old extension	ALTER EXTENSION ... UPDATE

Usage

Skill("postgresql-extensions")