Book Image

PostgreSQL 14 Administration Cookbook

By : Simon Riggs, Gianni Ciolli
5 (1)
Book Image

PostgreSQL 14 Administration Cookbook

5 (1)
By: Simon Riggs, Gianni Ciolli

Overview of this book

PostgreSQL is a powerful, open-source database management system with an enviable reputation for high performance and stability. With many new features in its arsenal, PostgreSQL 14 allows you to scale up your PostgreSQL infrastructure. With this book, you'll take a step-by-step, recipe-based approach to effective PostgreSQL administration. This book will get you up and running with all the latest features of PostgreSQL 14 while helping you explore the entire database ecosystem. You’ll learn how to tackle a variety of problems and pain points you may face as a database administrator such as creating tables, managing views, improving performance, and securing your database. As you make progress, the book will draw attention to important topics such as monitoring roles, validating backups, regular maintenance, and recovery of your PostgreSQL 14 database. This will help you understand roles, ensuring high availability, concurrency, and replication. Along with updated recipes, this book touches upon important areas like using generated columns, TOAST compression, PostgreSQL on the cloud, and much more. By the end of this PostgreSQL book, you’ll have gained the knowledge you need to manage your PostgreSQL 14 database efficiently, both in the cloud and on-premise.
Table of Contents (14 chapters)

Stopping the server in an emergency

If nothing else is working, we may need to stop the server quickly, without caring about disconnecting the clients gently.

Break the glass in case of emergency!

How to do it…

Follow these steps to stop the server:

  1. The basic command to perform an emergency stop on the server is as follows:
    pg_ctl -D datadir stop -m immediate
  2. On Debian/Ubuntu, you can also use the following command:
    pg_ctlcluster 14 main stop -m immediate

As we mentioned in the previous recipe, this is just a wrapper around pg_ctl. From this example, we can see that it can pass through the -m immediate option.

In the previous recipe, we saw examples where the systemctl command was used to stop a server safely; however, this command cannot be used to perform an emergency stop.

How it works…

When you do an immediate stop, all the users have their transactions aborted and all their connections are...