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Mastering PostgreSQL 13

You're reading from   Mastering PostgreSQL 13 Build, administer, and maintain database applications efficiently with PostgreSQL 13

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Product type Paperback
Published in Nov 2020
Publisher Packt
ISBN-13 9781800567498
Length 476 pages
Edition 4th Edition
Languages
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Author (1):
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Hans-Jürgen Schönig Hans-Jürgen Schönig
Author Profile Icon Hans-Jürgen Schönig
Hans-Jürgen Schönig
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Table of Contents (15) Chapters Close

Preface 1. PostgreSQL 13 Overview 2. Understanding Transactions and Locking FREE CHAPTER 3. Making Use of Indexes 4. Handling Advanced SQL 5. Log Files and System Statistics 6. Optimizing Queries for Good Performance 7. Writing Stored Procedures 8. Managing PostgreSQL Security 9. Handling Backup and Recovery 10. Making Sense of Backups and Replication 11. Deciding on Useful Extensions 12. Troubleshooting PostgreSQL 13. Migrating to PostgreSQL 14. Other Books You May Enjoy

Setting up asynchronous replication

The idea behind streaming replication is simple. After an initial base backup, the secondary can connect to the master and fetch a transaction log in real time and apply it. Transaction log replay is not a single operation anymore, but rather a continuous process that is supposed to keep running for as long as the cluster exists.

Performing a basic setup

In this section, we will learn how to set up asynchronous replication quickly and easily. The goal is to set up a system that consists of two nodes.

Basically, most of the work has already been done for WAL archiving. However, to make it easy to understand, we will look at the entire process of setting up streaming because we cannot assume that WAL shipping is really already set up as needed.

The first thing to do is to go to the postgresql.conf file and adjust the following parameters:

wal_level = replica
max_wal_senders = 10 # or whatever value >= 2
# this is...
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