Welcome to the course! This lesson focuses on ensuring scalability and performance in system designs. Interview questions in this area often aim to gauge your understanding of key strategies for scalable and efficient systems, as well as your ability to apply those concepts in real-world scenarios. Typical questions might include:

• What techniques do you use to ensure scalability in a system?
• How do you identify and resolve performance bottlenecks?
• What role does load balancing play in maintaining performance?

Such questions assess your theoretical knowledge and practical experience in designing systems that can handle increasing loads efficiently.

To answer questions about ensuring scalability and performance effectively, you should be acquainted with the following key concepts and their significance:

Scalability Techniques:

• Horizontal vs. Vertical Scaling:
  • Definition: Horizontal scaling involves adding more machines to a system, while vertical scaling enhances the capacity of existing machines.
  • Why It Matters: Horizontal scaling offers better fault tolerance and can handle larger scale-out processes. Vertical scaling is simpler but has hardware limits.

Performance Optimization:

• Load Balancing:

  • Definition: Distributing incoming network traffic across multiple servers.
  • Why It Matters: It ensures no single server becomes a bottleneck, improving response time and availability.

• Caching:

  • Definition: Storing copies of data in faster storage systems.
  • Why It Matters: Reduces the need to load data from slower sources repeatedly, enhancing speed.

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