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PostgreSQL 11 Administration Cookbook

You're reading from PostgreSQL 11 Administration Cookbook Over 175 recipes for database administrators to manage enterprise databases

Product type Paperback

Published in May 2019

Publisher Packt

ISBN-13 9781789537581

Length 600 pages

Edition 1st Edition

Languages

SQL

Tools

PostgreSQL

Concepts

Databases

Authors (3):

Simon Riggs

Gianni Ciolli

Meesala

View More author details

Table of Contents (18) Chapters

Preface

Who this book is for

What this book covers

To get the most out of this book

Sections

Get in touch

1. First Steps

2. Exploring the Database FREE CHAPTER

3. Configuration

4. Server Control

5. Tables and Data

6. Security

7. Database Administration

8. Monitoring and Diagnosis

9. Regular Maintenance

10. Performance and Concurrency

11. Backup and Recovery

12. Replication and Upgrades

Checking whether a user is connected

Here, we will show you how to learn 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 it that means bob is connected to the database. The returned value is the name of the database to which the user is connected.

...

The rest of the chapter is locked

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Authors (3)

Simon Riggs

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

See other products by Simon Riggs

Gianni Ciolli

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

See other products by Gianni Ciolli

Meesala

Meesala

Sudheer Kumar Meesala is a lead architect at Endurance International Group and has spent the last few years designing and building scalable and secure web applications within finance and internet industries. A large part of his job has included decomposing monolithic legacy applications into microservices. This has required a deep understanding of PostgreSQL, Cassandra, and other NoSQL databases. Other key areas of interest are container orchestration, DevOps, and more. He is also an accomplished speaker and trainer. He lives in Bangalore, India, and spends far too much time in traffic jams.

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