Book Image

Mastering PostgreSQL 15 - Fifth Edition

By : Hans-Jürgen Schönig
Book Image

Mastering PostgreSQL 15 - Fifth Edition

By: Hans-Jürgen Schönig

Overview of this book

Starting with an introduction to the newly released features of PostgreSQL 15, this updated fifth edition will help you get to grips with PostgreSQL administration and how to build dynamic database solutions for enterprise apps, including designing both physical and technical aspects of the system. You'll explore advanced PostgreSQL features, such as logical replication, database clusters, advanced indexing, and user management to manage and maintain your database. You'll then work with the PostgreSQL optimizer, configure PostgreSQL for high speed, and move from Oracle to PostgreSQL. Among the other skills that the book will help you build, you’ll cover transactions, handling recursions, working with JSON and JSONB data, and setting up a Patroni cluster. It will show you how to improve performance with query optimization. You'll also focus on managing network security and work with backups and replication while exploring useful PostgreSQL extensions that optimize the performance of large databases. By the end of this PostgreSQL book, you’ll be able to use your database to its utmost capacity by implementing advanced administrative tasks with ease.
Table of Contents (16 chapters)

Inspecting permissions

When all of the permissions have been set, it is sometimes necessary to know who has which permissions. It is vital for administrators to find out who is allowed to do what. Unfortunately, this process is not so easy and requires a bit of knowledge. Usually, I am a big fan of command-line usage. However, in the case of the permission system, it can really make sense to use a graphical user interface to do things.

Before I show you how to read PostgreSQL permissions, let’s assign rights to the role named joe so that we can inspect them in the next step:

test=# GRANT ALL ON t_person TO joe;
GRANT

Information about permissions can be retrieved using the z command in psql:

test=# \x
Expanded display is on.
test=# \z t_person
Access privileges
-[ RECORD 1 ]-----+------------------------------------------------------------
Schema            | public
Name      ...