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PostgreSQL 12 High Availability Cookbook

You're reading from   PostgreSQL 12 High Availability Cookbook Over 100 recipes to design a highly available server with the advanced features of PostgreSQL 12

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Product type Paperback
Published in Feb 2020
Publisher Packt
ISBN-13 9781838984854
Length 734 pages
Edition 3rd 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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Table of Contents (17) Chapters Close

Preface 1. Architectural Considerations 2. Hardware Planning FREE CHAPTER 3. Minimizing Downtime 4. Proxy and Pooling Resources 5. Troubleshooting 6. Monitoring 7. PostgreSQL Replication 8. Backup Management 9. High Availability with repmgr 10. High Availability with Patroni 11. Low-Level Server Mirroring 12. High Availability via Pacemaker 13. High Availability with Multi-Master Replication 14. Data Distribution 15. Zero-downtime Upgrades 16. Other Books You May Enjoy

Upgrading to asynchronous replication

Since the release of PostgreSQL 9.0, DBAs have had access to asynchronous streaming replication. This means all modern supported versions anyone is likely to encounter have this feature.

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...

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