In this chapter, we explored the basic building blocks of PostgreSQL. There are several shared objects across the database cluster. These shared objects are roles, tablespaces, databases including template databases, template procedural languages, and some setting parameters. The tablespace is a defined storage used normally by the databases administrator for optimization or maintenance purposes.

The template1 database is cloned each time a database is created. It can be loaded with extensions that should be available for all new databases. The template0 database provides a fallback strategy in case the template1 database is corrupted. Also, it can be used if the template1 locale is not the required locale.

The role has several attributes, such as login, superuser, and createdb. The role is named a user in the older PostgreSQL version if it can log in to the database, and a group if it cannot. Roles can be granted to other roles; this allows the database administrators to manage permissions...