Book Image

PostgreSQL High Availability Cookbook - Second Edition

By : Shaun Thomas
Book Image

PostgreSQL High Availability Cookbook - Second Edition

By: Shaun Thomas

Overview of this book

Databases are nothing without the data they store. In the event of a failure - catastrophic or otherwise - immediate recovery is essential. By carefully combining multiple servers, it’s even possible to hide the fact a failure occurred at all. From hardware selection to software stacks and horizontal scalability, this book will help you build a versatile PostgreSQL cluster that will survive crashes, resist data corruption, and grow smoothly with customer demand. It all begins with hardware selection for the skeleton of an efficient PostgreSQL database cluster. Then it’s on to preventing downtime as well as troubleshooting some real life problems that administrators commonly face. Next, we add database monitoring to the stack, using collectd, Nagios, and Graphite. And no stack is complete without replication using multiple internal and external tools, including the newly released pglogical extension. Pacemaker or Raft consensus tools are the final piece to grant the cluster the ability to heal itself. We even round off by tackling the complex problem of data scalability. This book exploits many new features introduced in PostgreSQL 9.6 to make the database more efficient and adaptive, and most importantly, keep it running.
Table of Contents (18 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback

Copying a few tables with Bucardo

Bucardo provides a very capable control mechanism in bucardo. Unlike Slony, which depends on an arcane programming language to create new replication sets and subscriptions, Bucardo is much more straightforward. As with Slony, we still want to copy data to other servers to avoid overwhelming our primary server.

In this recipe, we will utilize bucardo to create what Bucardo refers to as a relgroup. Bucardo herds contain one or more tables, and they are the basis of its synchronization system.

Let's begin.

Getting ready

We will be continuing where we left off in the Setting up Bucardo recipe. Please make sure that you have completed that recipe before continuing. As usual, we will use the pgbench utility to create an initial set of tables. Execute this command on the primary PostgreSQL server as the postgres user if you haven't already done so:

pgbench -i postgres

How to do it...

As with all of the previous recipes, will remain our replication subscriber...