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)
1
Section 1: Getting Started
5
Section 2: Interacting with the Database
12
Section 3: Administering the Cluster
20
Section 4: Replication
23
Section 5: The PostegreSQL Ecosystem

Summary

In this chapter you learned how PostgreSQL manages configuration through a main text file, postgresql.conf, that can be split into smaller pieces, depending on your needs. Every configuration option can be edited in the configuration file and can be inspected within the database thanks to dedicated system catalogs. This allows the database administrator to not only have a clear understanding of the currently running configuration but to also search for configuration errors and incorrectly loaded settings.

PostgreSQL also collects statistics; that is, runtime data that was gathered during the cluster's operational time. Those statistics can help an administrator understand what is going on, or what happened in the past, in the cluster. Thanks to a different set of catalogs, which was exposed in this chapter, you learned how to dig into the details of all the information that PostgreSQL has collected for you. Being able to track and analyze what single applications, users...