Book Image

Learn PostgreSQL

By : Luca Ferrari, Enrico Pirozzi
Book Image

Learn PostgreSQL

By: Luca Ferrari, Enrico Pirozzi

Overview of this book

PostgreSQL is one of the fastest-growing open source object-relational database management systems (DBMS) in the world. As well as being easy to use, it’s scalable and highly efficient. In this book, you’ll explore PostgreSQL 12 and 13 and learn how to build database solutions using it. Complete with hands-on tutorials, this guide will teach you how to achieve the right database design required for a reliable environment. You'll learn how to install and configure a PostgreSQL server and even manage users and connections. The book then progresses to key concepts of relational databases, before taking you through the Data Definition Language (DDL) and commonly used DDL commands. To build on your skills, you’ll understand how to interact with the live cluster, create database objects, and use tools to connect to the live cluster. You’ll then get to grips with creating tables, building indexes, and designing your database schema. Later, you'll explore the Data Manipulation Language (DML) and server-side programming capabilities of PostgreSQL using PL/pgSQL, before learning how to monitor, test, and troubleshoot your database application to ensure high-performance and reliability. By the end of this book, you'll be well-versed with the Postgres database and be able to set up your own PostgreSQL instance and use it to build robust solutions.
Table of Contents (27 chapters)
Section 1: Getting Started
Section 2: Interacting with the Database
Section 3: Administering the Cluster
Section 4: Replication
Section 5: The PostegreSQL Ecosystem


Roles are a powerful tool to represent both single users and a group of users. When a database connection attempt is made, PostgreSQL processes the connection credential information through the host-based access control so that it can immediately establish or reject the connection depending on firewall-like rules. Moreover, single users and groups can have other limitations to the number of connections they can open against a database or against the whole cluster.

In this chapter, you have seen how to create and manage roles, as well as how to allow single roles to connect to the cluster and to specific databases. In Chapter 10, Users, Roles, and Database Security, you will see how to deal with the security properties of users and groups, but before you proceed further, you need to know how PostgreSQL objects can be created and managed.

In the following chapter, you will learn how to interact with the PostgreSQL database using SQL statements.