Book Image

Mastering PostgreSQL 9.6

By : Hans-Jürgen Schönig
Book Image

Mastering PostgreSQL 9.6

By: Hans-Jürgen Schönig

Overview of this book

PostgreSQL is an open source database used for handling large datasets (Big Data) and as a JSON document database. It also has applications in the software and web domains. This book will enable you to build better PostgreSQL applications and administer databases more efficiently. We begin by explaining the advanced database design concepts in PostgreSQL 9.6, along with indexing and query optimization. You will also see how to work with event triggers and perform concurrent transactions and table partitioning, along with exploring SQL and server tuning. We will walk you through implementing advanced administrative tasks such as server maintenance and monitoring, replication, recovery and high availability, and much more. You will understand the common and not-so-common troubleshooting problems and how you can overcome them. By the end of this book, you will have an expert-level command of the advanced database functionalities and will be able to implement advanced administrative tasks with PostgreSQL.
Table of Contents (14 chapters)
Free Chapter
PostgreSQL Overview

Digging into row-level security - RLS

Up to this point, a table has always been shown as a whole. When the table contained 1 million rows, it was possible to retrieve 1 million rows from it. If somebody had the rights to read a table, it was all about the entire table. In many cases, this is not enough. Often it is desirable that a user is not allowed to see all the rows.

Consider the following real-world example: an accountant is doing accounting work for many people. The table containing tax rates should really be visible to everybody as everybody has to pay the same rates. However, when it comes to the actual transactions, you might want to ensure that everybody is only allowed to see his or her own transactions. Person A should not be allowed to see person B's data. In addition to that, it might also make sense that the boss of a division is allowed to see all the data in his part of the company.