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Mastering PostgreSQL 15

You're reading from   Mastering PostgreSQL 15 Advanced techniques to build and manage scalable, reliable, and fault-tolerant database applications

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Product type Paperback
Published in Jan 2023
Publisher Packt
ISBN-13 9781803248349
Length 522 pages
Edition 5th 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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Toc

Table of Contents (16) Chapters Close

Preface 1. Chapter 1: PostgreSQL 15 Overview 2. Chapter 2: Understanding Transactions and Locking FREE CHAPTER 3. Chapter 3: Making Use of Indexes 4. Chapter 4: Handling Advanced SQL 5. Chapter 5: Log Files and System Statistics 6. Chapter 6: Optimizing Queries for Good Performance 7. Chapter 7: Writing Stored Procedures 8. Chapter 8: Managing PostgreSQL Security 9. Chapter 9: Handling Backup and Recovery 10. Chapter 10: Making Sense of Backups and Replication 11. Chapter 11: Deciding on Useful Extensions 12. Chapter 12: Troubleshooting PostgreSQL 13. Chapter 13: Migrating to PostgreSQL 14. Index 15. Other Books You May Enjoy

Setting up asynchronous replication

The idea behind streaming replication is simple. After an initial base backup, the secondary backup can connect to the master, 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 a 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 &gt...
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