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


An index is a data structure that allows faster access to the underlying table so that specific tuples can be found quickly. Here, "quickly" means faster than scanning the whole underlying table and analyzing every single tuple.

PostgreSQL supports different types of indexes, and not all types are optimal for every scenario and workload. In the following sections, you will discover the main types of indexes that PostgreSQL provides, but in any case, you can extend PostgreSQL with your own indexes or indexes provided by extensions.

An index in PostgreSQL can be built on a single column or multiple columns at once; PostgreSQL supports indexes with up to 32 columns.

An index can cover all the data in the underlying table, or can index specific values only – in that case, the index is known as "partial." For example, you can decide to index only those values of certain columns that you are going to use the most.

An index can also be unique, meaning that...