Engineering scalability into an application

Question

What does it mean to say - Engineering scalability into applications. Are there design patterns that would make an application more scalable? This question is mainly in the cont

Answer 1

I think when you're talking about the web, you're mainly concerned with:

• Partitioning your code such that it can, if necessary, be divided vertically (for one request) along many servers.
• Adjusting your code such that all data (especially session data) is persisted in some sort of global store (like a database) rather than locally in the filesystem.
• Load balancing.

With this, you can stretch one server into however many tiers (application tier, caching tier, database tier) and expand those horizontally should a scaling problem arise.