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

Basic concepts

First of all, let's try to understand why we have to partition data. We should start by saying that a common constant of all databases is that their size always grows. It is, therefore, possible that a database, after a few months of growth, can reach a size of gigabytes, terabytes, or petabytes.

Another thing we must always keep in mind is that not all tables grow at the same rate or to the same level; there are tables that will be bigger than other tables and there will be indexes too that will be bigger than other indexes.

We also need to know that there is a part of our server's RAM memory shared among all the Postgres processes that is used to manage the data that is present in tables. This part of the server's RAM is called shared_buffers.

The way PostgreSQL works is as follows:

  1. Data is taken from disks.
  2. Data is placed in shared buffers.
  3. Data is processed in shared buffers.
  4. Data is downloaded to disks.

Typically, in a dedicated server only for PostgreSQL...