Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases now! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Arrow up icon
GO TO TOP
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.

Arrow left icon
Product type Paperback
Published in Jul 2014
Publisher Packt
ISBN-13 9781849516969
Length 398 pages
Edition 1st Edition
Arrow right icon
Author (1):
Arrow left icon
Shaun Thomas Shaun Thomas
Author Profile Icon Shaun Thomas
Shaun Thomas
Arrow right icon
View More author details
Toc

Table of Contents (12) Chapters Close

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

Talking to the right shard

In this chapter, we have chosen to represent database shards as PostgreSQL schema names. So, if our basic schema is named myapp, shard 1 would be myapp1, shard 15 would be myapp15, and so on. This is what we call the logical shard name.

Beyond this, shards should be independent of each other such that they can be relocated to another PostgreSQL server arbitrarily. However, if shards can be moved at will, how do we find them? Much like LVM has a physical drive, logical shards have a corresponding physical shard. The physical shard is the server where the logical shard currently resides. Think of it like this diagram:

Talking to the right shard

Elements such as clients, products, and vendors are shared resources that all PostgreSQL shard servers can use. This is where our foreign tables would be beneficial. The logical shards (schemas) myapp1 through myapp4 all reside on PG Server 1, and myapp5 through myapp8 live on PG Server 2. In this architecture, we have eight logical shards distributed...

lock icon The rest of the chapter is locked
Register for a free Packt account to unlock a world of extra content!
A free Packt account unlocks extra newsletters, articles, discounted offers, and much more. Start advancing your knowledge today.
Unlock this book and the full library FREE for 7 days
Get unlimited access to 7000+ expert-authored eBooks and videos courses covering every tech area you can think of
Renews at $19.99/month. Cancel anytime