Can you list the main types of system scaling?

Main types of system scaling:

1. Vertical Scaling (Scale Up) — increasing resources of a single server (CPU, RAM, disk). A simple method but limited by hardware capabilities.

2. Horizontal Scaling (Scale Out) — adding new servers to the system, distributing the load among them.

3. Load-Based Scaling (Load Scaling) — dynamically adding or removing resources depending on current load.

4. Database Scaling:

   • Replication — creating copies of the database to distribute read load.
   • Sharding — partitioning data by key to distribute write and read operations.

5. Cache Scaling — using distributed cache systems to reduce load on the database.

The choice depends on the application's architecture and fault tolerance requirements.