What you don't know about indexing in PostgreSQL - why they don't always help?

Indexes in databases are a crucial component that enables faster and more efficient data retrieval. The article presents several interesting facts and lesser-known information about indexes. Firstly, indexes not only speed up queries but can also slow down insertion operations, which is often overlooked by developers. It is also essential to understand that index fragmentation can affect their performance, making regular maintenance necessary. Additionally, different types of indexes, such as unique indexes or full-text indexes, have specific use cases that are worth knowing to fully exploit the capabilities of databases. Finally, selecting the right indexes can significantly enhance application performance, which is vital for projects dealing with large datasets.