Book Image

Mastering PostgreSQL 15 - Fifth Edition

By : Hans-Jürgen Schönig
Book Image

Mastering PostgreSQL 15 - Fifth Edition

By: Hans-Jürgen Schönig

Overview of this book

Starting with an introduction to the newly released features of PostgreSQL 15, this updated fifth edition will help you get to grips with PostgreSQL administration and how to build dynamic database solutions for enterprise apps, including designing both physical and technical aspects of the system. You'll explore advanced PostgreSQL features, such as logical replication, database clusters, advanced indexing, and user management to manage and maintain your database. You'll then work with the PostgreSQL optimizer, configure PostgreSQL for high speed, and move from Oracle to PostgreSQL. Among the other skills that the book will help you build, you’ll cover transactions, handling recursions, working with JSON and JSONB data, and setting up a Patroni cluster. It will show you how to improve performance with query optimization. You'll also focus on managing network security and work with backups and replication while exploring useful PostgreSQL extensions that optimize the performance of large databases. By the end of this PostgreSQL book, you’ll be able to use your database to its utmost capacity by implementing advanced administrative tasks with ease.
Table of Contents (16 chapters)

Handling global data

In the previous sections, we learned about pg_dump and pg_restore, which are two vital programs when it comes to creating backups. The thing is, pg_dump creates database dumps—it works at the database level. If we want to back up an entire instance, we have to use pg_dumpall or dump all of the databases separately. Before we dig into that, it makes sense to see how pg_dumpall works:

pg_dumpall > /tmp/all.sql

pg_dumpall will connect to one database after the other and send stuff to stdout, where you can process it with Unix. Note that pg_dumpall can be used just like pg_dump. However, it has some downsides. It does not support a custom or directory format, and therefore does not offer multi-core support. This means that we will be stuck with one thread.

However, there is more to pg_dumpall. Keep in mind that users live at the instance level. If you create a normal database dump, you will get all of the permissions, but you won’t get all...