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scalability-knowledge

Scalability knowledge base. Provides vertical vs horizontal scaling, stateless design, session management, connection pooling, capacity planning, and PHP-FPM tuning for scalability audits.

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# Scalability Knowledge Base

Quick reference for scalability patterns, stateless design, PHP-FPM tuning, and capacity planning in PHP applications.

## Vertical vs Horizontal Scaling

| Aspect | Vertical (Scale Up) | Horizontal (Scale Out) |
|--------|---------------------|------------------------|
| Approach | Bigger server (CPU, RAM) | More servers |
| Cost curve | Exponential (diminishing returns) | Linear (commodity hardware) |
| Downtime | Often required for upgrade | Zero-downtime rolling deploys |
| Limit | Hardware ceiling | Theoretically unlimited |
| Complexity | Low (single server) | High (distributed system) |
| Data consistency | Simple (single node) | Requires distributed coordination |