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
Transactions, MVCC, WALs, and Checkpoints

This chapter introduces you to transactions, a fundamental part of every enterprise-level database system. PostgreSQL has very rich and standard-compliant transaction machinery that allows users to exactly define transaction properties, including nested transactions.

PostgreSQL relies heavily on transactions to keep data consistent across concurrent connections and parallel activities, and thanks to Write-Ahead Logs (WALs), PostgreSQL does its best to keep the data safe and reliable. Moreover, PostgreSQL implements Multi-Version Concurrency Control (MVCC), a way to maintain high concurrency between transactions.

The chapter can be split into two parts: the first one is more practical and provides concrete examples of what transactions are, how to use them, and how to understand MVCC. The second part is much more theoretical and explains...