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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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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

Using a foreign table in a query

Foreign tables exist as empty shells on the local database, lending merely their structure for query-planning and data-fetching purposes. The foreign data wrapper transforms data requests to something the remote server can understand and presents it in a way PostgreSQL will recognize.

As we're using the postgres_fdw wrapper, the situation is simplified. A PostgreSQL server should have less trouble communicating with another PostgreSQL server than an Oracle server, for instance. Though this means less transformation, there are still limitations to what functionality a foreign table might provide compared to a local table.

In this recipe, we'll use a foreign table in a few scenarios and examine how it performs in each. We'll also explore some of the common caveats involved in foreign table access.

Getting ready

As we will be using the pgbench_accounts foreign table in this recipe, please follow all the previous recipes before proceeding.

How to do...

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