Scalability Guide | Horizontal & Vertical Scaling…

Building Systems That Grow with Demand

Understanding Scalability

Scalability is the ability of a system to handle increased load by adding resources. A scalable system can grow to meet rising demands without significant performance degradation.

Example: Scaling Implementation

Database Read Replicas

Horizontal scaling with read replicas allows multiple users to access data concurrently, distributing the load and improving responsiveness for read-heavy workloads.

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connections, and IP hash. Load balancers can be hardware, software, or

How do I scale a database?

Scale databases using read replicas (for read-heavy workloads), sharding (partitioning data), caching (Redis, Memcached) to optimize performance and handle increased traffic.

Frequently asked questions

What is horizontal scaling and how does it relate to handling increasing system load?

Horizontal scaling involves adding more instances of an application or service, distributing the workload across multiple machines. This approach allows a system to handle increased traffic by simply deploying more servers.

What are stateless services and why are they important for cloud-based applications?

Stateless services do not retain any client session information, meaning each request is treated independently. This simplifies scaling because any instance can handle any request without needing to manage user sessions.

How can I design an application to be stateless?

To create a stateless application, avoid storing session data on the server; instead, use external storage like Redis or a database for session management, and consider employing JWT (JSON Web Tokens) for authentication.

What is the role of external storage in maintaining session state within a scalable system?

External storage solutions such as Redis or databases are ideal for storing session data, allowing multiple application instances to access and update the same session information consistently.

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Everything above runs in your browser — open Hash Function Avalanche Visualizer and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

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Scalability Guide | Horizontal & Vertical Scaling Strategies

Building Systems That Grow with Demand

Example: Scaling Implementation

connections, and IP hash. Load balancers can be hardware, software, or

Frequently asked questions

▶ Try it live

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