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

Cluster configuration

PostgreSQL is configured by means of a bunch of text files that contain directives and values used to bootstrap the cluster and get it running. We saw how configuration files are handled at the beginning of this book and throughout, whenever we needed to perform particular configurations, such as to manage logging. This section will revisit and explain how to configure a cluster in more detail.

There are two main configuration files that present the starting point for any configuration:

  • postgresql.conf is the main cluster configuration file and contains all the data required to start the cluster, set up processes (as WAL senders) and logging, and configure how the cluster will accept connections (for example, on which TCP/IP address).
  • pg_hba.conf is the file that's used to allow or deny the client connections to the cluster. It was explained extensively in Chapter 3, Managing Users and Connections, and is related to the users and roles authentication mechanisms...