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PostgreSQL 16 Administration Cookbook

PostgreSQL 16 Administration Cookbook

By : GIANNI CIOLLI, Boriss Mejías, Jimmy Angelakos, Vibhor Kumar, Simon Riggs
4.8 (27)
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PostgreSQL 16 Administration Cookbook

PostgreSQL 16 Administration Cookbook

4.8 (27)
By: GIANNI CIOLLI, Boriss Mejías, Jimmy Angelakos, Vibhor Kumar, Simon Riggs

Overview of this book

PostgreSQL has seen a huge increase in its customer base in the past few years and is becoming one of the go-to solutions for anyone who has a database-specific challenge. This PostgreSQL book touches on all the fundamentals of Database Administration in a problem-solution format. It is intended to be the perfect desk reference guide. This new edition focuses on recipes based on the new PostgreSQL 16 release. The additions include handling complex batch loading scenarios with the SQL MERGE statement, security improvements, running Postgres on Kubernetes or with TPA and Ansible, and more. This edition also focuses on certain performance gains, such as query optimization, and the acceleration of specific operations, such as sort. It will help you understand roles, ensuring high availability, concurrency, and replication. It also draws your attention to aspects like validating backups, recovery, monitoring, and scaling aspects. This book will act as a one-stop solution to all your real-world database administration challenges. By the end of this book, you will be able to manage, monitor, and replicate your PostgreSQL 16 database for efficient administration and maintenance with the best practices from experts.
Table of Contents (15 chapters)
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13
Other Books You May Enjoy
14
Index

Checking which queries are running

In this section, we will show you how to check which query is currently running.

Getting ready

You must make sure that you are logged in as a superuser or as the same database user you want to check. Also, ensure that the track_activities = on parameter is set (which it normally should be, being the default setting). If not, check the Updating the parameter file recipe in Chapter 3, Server Configuration.

How to do it…

To see which queries connected users are running at this moment, just run the following code:

SELECT datname, usename, state, backend_type, query
       FROM pg_stat_activity;

This will show normal users as “client backend,” but it will also show various PostgreSQL worker processes that you may not want to see. So, you could filter this using WHERE backend_type = 'client backend'.

On systems with a lot of users, you may notice that the majority of backends have state set to...

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