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

Introducing various types of backups and restores

There are mainly two types of backups that apply to PostgreSQL: the logical backup (also known as a cold backup) and the physical backup (also known as a hot backup). Depending on the type of backup you choose, the restore process will differ accordingly.
PostgreSQL ships will all the integrated tools to perform the classical logical backup, which in most cases suffices. However, PostgreSQL can easily be configured to support physical backups, which are useful when the size of the cluster becomes huge, as well as when you have particular needs, as you will discover later in this chapter.

But what is the difference between these two backup methods? As you can imagine, they both achieve the very same aim: allowing you to get a usable "copy" of your data to restore either on the same cluster or against another cluster. However, the difference between the two backup strategies come from the way data is extracted from the cluster...