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infrastructure/databases/postgresql/SKILL.md

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+---
+name: postgresql
+description: Administer PostgreSQL databases. Configure replication, backups, and performance tuning. Use when managing PostgreSQL deployments.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# PostgreSQL
+
+Administer and optimize PostgreSQL databases.
+
+## Installation & Setup
+
+```bash
+# Install
+apt install postgresql postgresql-contrib
+
+# Access
+sudo -u postgres psql
+
+# Create database and user
+CREATE USER myapp WITH PASSWORD 'secret';
+CREATE DATABASE mydb OWNER myapp;
+GRANT ALL PRIVILEGES ON DATABASE mydb TO myapp;
+```
+
+## Configuration
+
+```bash
+# /etc/postgresql/15/main/postgresql.conf
+max_connections = 200
+shared_buffers = 256MB
+effective_cache_size = 768MB
+work_mem = 4MB
+maintenance_work_mem = 64MB
+```
+
+## Backup & Restore
+
+```bash
+# Backup
+pg_dump mydb > backup.sql
+pg_dump -Fc mydb > backup.dump  # Custom format
+
+# Restore
+psql mydb < backup.sql
+pg_restore -d mydb backup.dump
+```
+
+## Replication
+
+```bash
+# Primary
+ALTER SYSTEM SET wal_level = replica;
+CREATE USER replicator REPLICATION LOGIN PASSWORD 'secret';
+
+# Replica
+pg_basebackup -h primary -U replicator -D /var/lib/postgresql/15/main -P
+```
+
+## Best Practices
+
+- Regular VACUUM and ANALYZE
+- Monitor slow queries
+- Implement connection pooling (PgBouncer)
+- Regular backups with pg_dump or pg_basebackup