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PostgreSQL 9 High Availability Cookbook

You're reading from   PostgreSQL 9 High Availability Cookbook Over 100 recipes to design and implement a highly available server with the advanced features of PostgreSQL.

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Product type Paperback
Published in Jul 2014
Publisher Packt
ISBN-13 9781849516969
Length 398 pages
Edition 1st Edition
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Author (1):
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Shaun Thomas Shaun Thomas
Author Profile Icon Shaun Thomas
Shaun Thomas
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Toc

Table of Contents (12) Chapters Close

Preface 1. Hardware Planning 2. Handling and Avoiding Downtime FREE CHAPTER 3. Pooling Resources 4. Troubleshooting 5. Monitoring 6. Replication 7. Replication Management Tools 8. Advanced Stack 9. Cluster Control 10. Data Distribution Index

Upgrading to asynchronous replication


Since the release of PostgreSQL 9.0, DBAs have had access to asynchronous streaming replication. Unlike the older hot standby methods used in earlier versions, replica servers can connect to an upstream PostgreSQL server and consume data modifications directly. With low network latency and fast transactions, this means that it is fairly common for streaming replicas to lag behind the master by only a few milliseconds.

In the context of high availability, this means we can scale horizontally by copying the database to multiple servers. Of course, this means that we need to copy the entire database to each server. For small-to medium-sized database instances, this is a relatively minor requirement. This also means that we can produce up-to-date backups, perform ad hoc queries on practically live data, and aggregate information into reports without disrupting our primary database.

This recipe will explain how to set up a streaming asynchronous database replica...

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