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

Monitoring the cluster

Monitoring the cluster allows you to understand what the cluster is doing at any given point in time and potentially act and react accordingly to avoid degradation in the performance and usability of databases. PostgreSQL provides a rich set of catalogs that allow a database administrator to monitor the overall activity by issuing only SQL statements and queries. You can also combine the results of the information coming from the catalog with other external monitoring tools, ranging from your operating system's tools to more complex ones such as Nagios.

In this section, we will have a look at the main PostgreSQL catalogs used to monitor and collect information about database activities. As you can imagine, only a database administrator can get complete information about overall cluster activities.

The cluster collects information about activities by means of the statistic collector, a dedicated process that is responsible for collecting, and therefore providing...