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PostgreSQL 16 Administration Cookbook

You're reading from PostgreSQL 16 Administration Cookbook

Product type Book

Published in Dec 2023

Publisher Packt

ISBN-13 9781835460580

Pages 636 pages

Edition 1st Edition

Languages

Concepts

Database Administration

Authors (5):

Gianni Ciolli

Boriss Mejías

Jimmy Angelakos

Vibhor Kumar

Simon Riggs

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Table of Contents (15) Chapters

Preface

First Steps

Exploring the Database

Server Configuration

Server Control

Tables and Data

Security

Database Administration

Monitoring and Diagnosis

Regular Maintenance

Performance and Concurrency

Backup and Recovery

Replication and Upgrades

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Index

Checking whether a user is connected

Here, we will show you how to find out whether a certain database user is currently connected to the database.

Getting ready

If you are logged in as a superuser, you will have full access to monitoring information.

How to do it…

Issue the following query to see whether the user bob is connected:

SELECT datname FROM pg_stat_activity WHERE usename = 'bob';

If this query returns any rows, then that means that bob is connected to the database. The returned value is the name of the database that the user is connected to.

How it works…

PostgreSQL’s pg_stat_activity system view keeps track of all running PostgreSQL backends. This includes information such as the query that is being currently executed, the last query that was executed by each backend, who is connected, when the connection, transaction, and/or query were started, and so on.

There’s more…

Please spend a...

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Authors (5)

Gianni Ciolli

Gianni Ciolli is Vice President and Field CTO at EDB; he was Global Head of Professional Services at 2ndQuadrant until it was acquired by EDB. Gianni has been a PostgreSQL consultant, trainer, and speaker at many PostgreSQL conferences in Europe and abroad over more than 10 years. He has a PhD in Mathematics from the University of Florence. He has worked with free and Open-Source software since the 1990s and is active in the community. He lives between Frankfurt and London and plays the piano in his spare time

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Boriss Mejías

Boriss Mejias is a Senior Solutions Architect at EDB, building on his experience as PostgreSQL consultant and trainer at 2ndQuadrant. He has been working with open source software since the beginning of the century contributing to several projects both with code and community work. He has a PhD in Computer Science from the Université catholique de Louvain, and an Engineering degree from Universidad de Chile.Complementary to his role as Solutions Architect, he gives PostgreSQL training and is a regular speaker at PostgreSQL conferences. He loves spending time with his family and playing air guitar

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Jimmy Angelakos

Jimmy Angelakos is a Systems and Database Architect and recognized PostgreSQL expert. He studied Computer Science at the University of Aberdeen, has worked with Open-Source tools for 25+ years, is an active member of PostgreSQL Europe and occasional contributor to the PostgreSQL project. He also speaks frequently at database and Free & Open-Source Software conferences

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Vibhor Kumar

Vibhor Kumar, Global VP at EDB, is a pioneering data tech leader. He manages a global team of engineers, optimizing clients' Postgres databases for peak performance and scalability. He advises Fortune 500 clients, including many Financial Institutes, in innovating and transforming their data platforms. His past experience spans IBM, BMC Software, and CMC Ltd. He holds a BSc in Computer Science from the University of Lucknow and a Master's from the Army Institute of Management. As a certified expert in numerous technologies, he often shares his insights on DevOps, cloud, and database optimization through blogging and speaking at events

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Simon Riggs

Simon Riggs is a Major Developer of PostgreSQL since 2004. Formerly, Simon was the Founder and CEO of 2ndQuadrant, acquired by EDB in 2020. Simon has contributed widely to PostgreSQL, initiating new projects, contributing ideas, committing many important features as well and working directly with database architects and users on advanced solutions

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