Understanding PostgreSQL Internals: Clusters and Tables

A technical article provides an in-depth look at the internal architecture of PostgreSQL. The author explains the fundamental concepts of database clusters and their structure. It details how databases and tables are physically organized within the system. The guide aims to demystify the storage hierarchy used by the relational database. Readers will gain a better understanding of the file system layout behind their data. This knowledge is essential for database administrators aiming to optimize performance. The piece breaks down the relationship between logical objects and physical files. It serves as an educational resource for developers working with PostgreSQL internals.