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

Introduction to logging

Like many other services and databases, PostgreSQL provides its own logging infrastructure so that the administrator can always inspect what the daemon process is doing and what the current status of the database system is. While logs are not vital for the data and database activities, they represent very important knowledge about what has happened or is happening in the whole system and represent an important clue by means of which an administrator can take action.

PostgreSQL has a very flexible and configurable log infrastructure that allows different logging configuration, rotation, archiving, and post-analysis.

Logs are stored in a textual form, so that they can be easily analyzed with common log analysis tools, including operating system utilities such as grep(1), sed(1), and text editors.

The term "log," as used in this chapter, refers only to the system's textual logs, and not to the write-ahead logs that, on the other hand, are crucial in...