What is proactive tuning and reactive tuning?

Tuning aims to increase and optimize Oracle’s throughput. In Proactive tuning, different strategies are developed for different kinds of processing. Here, the database is tuned by finding the optimal hardware selection, capacity planning and settings to increase throughput. It is called proactive as the administrator proactively devises strategies for the architecture. Reactive tuning involves performance tuning and troubleshooting within boundaries of existing architecture.