Book Image

PostgreSQL 11 Administration Cookbook

By : Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala
Book Image

PostgreSQL 11 Administration Cookbook

By: Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala

Overview of this book

PostgreSQL is a powerful, open source database management system with an enviable reputation for high performance and stability. With many new features in its arsenal, PostgreSQL 11 allows you to scale up your PostgreSQL infrastructure. This book takes a step-by-step, recipe-based approach to effective PostgreSQL administration. The book will introduce you to new features such as logical replication, native table partitioning, additional query parallelism, and much more to help you to understand and control, crash recovery and plan backups. You will learn how to tackle a variety of problems and pain points for any database administrator such as creating tables, managing views, improving performance, and securing your database. As you make steady progress, the book will draw attention to important topics such as monitoring roles, backup, and recovery of your PostgreSQL 11 database to help you understand roles and produce a summary of log files, ensuring high availability, concurrency, and replication. By the end of this book, you will have the necessary knowledge to manage your PostgreSQL 11 database efficiently.
Table of Contents (19 chapters)
Title Page
Copyright and Credits
About Packt

Logical replication

Logical replication allows us to stream logical data changes between two nodes. By logical, we mean streaming changes to data without referring to specific physical attributes such as a block number and row ID.

The main benefits of logical replication are as follows:

  • Performance is roughly two times better than that of the best trigger-based mechanisms
  • Selective replication is supported, so we don't need to replicate the entire database (only available with pglogical at present)
  • Replication can occur between different major releases, which can allow a zero-downtime upgrade

PostgreSQL 9.4 onwards provides a feature called logical decoding. This allows you to stream a set of changes out of a master server. This allows a master to become a sending node in logical replication. The receiving node requires a logical replication plugin to allow replication between two nodes.

Previously, we referred to physical replication as streaming replication. Now, we have to modify our descriptions...