Nowadays, it is very easy to design a database with the help of modern tools and processes, but we must know that it is a very crucial part of our application and it directly impacts the application performance. Once an application has been implemented with an inaccurate database design, it's too late to fix it. We have no other option but to buy expensive hardware to cope with the problem. So, we should be aware of some of the basic concepts and best practices of database table design, database partitioning, and good indexing, which improve our application's performance. Let's see the fundamental rules and best practices for developing high-performance database applications.