Book Image

Mastering PostgreSQL 9.6

By : Hans-Jürgen Schönig
Book Image

Mastering PostgreSQL 9.6

By: Hans-Jürgen Schönig

Overview of this book

PostgreSQL is an open source database used for handling large datasets (Big Data) and as a JSON document database. It also has applications in the software and web domains. This book will enable you to build better PostgreSQL applications and administer databases more efficiently. We begin by explaining the advanced database design concepts in PostgreSQL 9.6, along with indexing and query optimization. You will also see how to work with event triggers and perform concurrent transactions and table partitioning, along with exploring SQL and server tuning. We will walk you through implementing advanced administrative tasks such as server maintenance and monitoring, replication, recovery and high availability, and much more. You will understand the common and not-so-common troubleshooting problems and how you can overcome them. By the end of this book, you will have an expert-level command of the advanced database functionalities and will be able to implement advanced administrative tasks with PostgreSQL.
Table of Contents (14 chapters)
Free Chapter
PostgreSQL Overview

Inspecting permissions

When all permissions are 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, I will assign rights to the joe role so that we can inspect them in the next step:

test=# GRANT ALL ON t_person TO joe; 

Retrieving information about permissions can be done using the z command in psql:

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