Book Image

PostgreSQL 9 High Availability Cookbook

By : Shaun Thomas
Book Image

PostgreSQL 9 High Availability Cookbook

By: Shaun Thomas

Overview of this book

A comprehensive series of dependable recipes to design, build, and implement a PostgreSQL server architecture free of common pitfalls that can operate for years to come. Each chapter is packed with instructions and examples to simplify even highly complex database operations. If you are a PostgreSQL DBA working on Linux systems who want a database that never gives up, this book is for you. If you've ever experienced a database outage, restored from a backup, spent hours trying to repair a malfunctioning cluster, or simply want to guarantee system stability, this book is definitely for you.
Table of Contents (12 chapters)
11
Index

Setting up Slony


While there are a few logical asynchronous replication systems for PostgreSQL, Slony-I (Slony in short) was the first to gain wide adoption. Why would we use Slony when PostgreSQL already has replication? Currently, PostgreSQL replication can only copy the entire installation. Every database, schema, table, and user is copied at the binary level. In effect, streaming replication creates perfect clones of PostgreSQL servers.

Slony is very different. It is designed to copy tables only, capturing changes on a master server and sending them to one or more subscribers. If you want this type of replication, this section will provide a basic installation recipe designed for one master and one subscriber.

Getting ready

In order to install Slony, we will need the source code. At the time of writing this book, the latest version available is 2.2.2. You can obtain a copy of the source at http://slony.info/downloads/2.2/source/.

We only need the primary source package, but feel free to...