Book Image

PostgreSQL 11 Administration Cookbook

By : Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala
Book Image

PostgreSQL 11 Administration Cookbook

By: Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala

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 11 allows you to scale up your PostgreSQL infrastructure. This book takes a step-by-step, recipe-based approach to effective PostgreSQL administration. The book will introduce you to new features such as logical replication, native table partitioning, additional query parallelism, and much more to help you to understand and control, crash recovery and plan backups. You will learn how to tackle a variety of problems and pain points for any database administrator such as creating tables, managing views, improving performance, and securing your database. As you make steady progress, the book will draw attention to important topics such as monitoring roles, backup, and recovery of your PostgreSQL 11 database to help you understand roles and produce a summary of log files, ensuring high availability, concurrency, and replication. By the end of this book, you will have the necessary knowledge to manage your PostgreSQL 11 database efficiently.
Table of Contents (19 chapters)
Title Page
Copyright and Credits
About Packt

Revoking user access to a table

This recipe answers the question: how do I make sure that user X cannot access table Y?

Getting ready

The current user must either be a superuser, the owner of the table, or a user with a GRANT option for the table.


Also, bear in mind that you can't revoke rights from a user who is a superuser.

How to do it…

To revoke all rights on the table1 table from the user2 user, you must run the following SQL command:

REVOKE ALL ON table1 FROM user2;

However, if user2 has been granted another role that gives them some rights on table1, say role3, this command is not enough; you must also choose one of the following options:

  • Fix the user—that is, revoke role3 from user2
  • Fix the role—that is, revoke privileges on table1 from role3

Both choices are imperfect because of their side-effects. The former will revoke all of the privileges associated to role3, not just the privileges concerning table1; the latter will revoke the privileges on table1 from all of the other users that have...