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)

Moving from Oracle to PostgreSQL

So far, we have seen how the most important advanced SQL features can be ported or used in PostgreSQL. Given this introduction, it is time to take a look at migrating Oracle database systems in particular.

These days, migrating from Oracle to PostgreSQL has become really popular due to Oracle’s new license and business policy. Around the world, people are moving away from Oracle and adopting PostgreSQL.

Using the oracle_fdw extension to move data

One of my preferred methods to move users from Oracle to PostgreSQL is Laurenz Albe’s oracle_fdw extension (https://github.com/laurenz/oracle_fdw). It is a foreign data wrapper (FDW) that allows you to represent a table in Oracle as a table in PostgreSQL. The oracle_fdw extension is one of the most sophisticated FDWs and is rock solid, well-documented, free, and open source.

Installing the oracle_fdw extension requires you to install the Oracle client library. Fortunately, there are...