Slony-I 2.2.7 Documentation
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# Chapter 1. Preface

# 1.1. Introduction to Slony-I

## 1.1.1. What Is Slony-I

Slony-I is a "master to multiple slaves" replication system for PostgreSQL supporting cascading and slave promotion. Key features of Slony-I include:

- Slony-I can replicate data between different PostgreSQL major versions

- Slony-I can replicate data between different hardware or operating systems

- Slony-I allows you to only replicate some of the tables to slave

- Slony-I allows you to replicate some tables to one slave and other tables to another slave

- Slony-I allows different database servers to be the origin(master) for different tables

## 1.1.2. About This Book

This book is intended as an administration guide and reference for Slony-I version 2.2.7 If you are using a different version of Slony-I then you should refer to the administration guide for that version.

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