PostgreSQL is a reliable open source database available in many modern distribution’s repository. The ease of use, the ability to use extensions and the stability it provides all add to it’s popularity. While providing the base functionality, like answering to SQL queries, store inserted data consistently, handling transactions, etc. most mature database solutions provide tools and know-hows on how to tune the database, identify possible bottlenecks, and be able to solve performance problems bound to happen as the system powered by the given solution grows.