Book Image

PostgreSQL 9 Admin Cookbook

By : Simon Riggs, Hannu Krosing
Book Image

PostgreSQL 9 Admin Cookbook

By: Simon Riggs, Hannu Krosing

Overview of this book

<p>PostgreSQL is a powerful, open source object-relational database system. An enterprise database, PostgreSQL includes features such as Multi-Version Concurrency Control (MVCC), point-in-time recovery, tablespaces, asynchronous replication, nested transactions (savepoints), online/hot backups, a sophisticated query planner/optimizer, and write-ahead logging for fault tolerance. PostgreSQL 9 Admin cookbook covers everything a database administrator needs to protect, manage and run a healthy and efficient PostgreSQL 9.0 database.</p> <p>PostgreSQL 9 Admin Cookbook describes key aspects of the PostgreSQL open source database system. The book covers everything a sysadmin or DBA needs to protect, manage, and run a healthy and efficient PostgreSQL 9 database. This hands-on guide will assist developers working on live databases, supporting web or enterprise software applications using Java, Python, Ruby, or .Net from any development framework. It's easy to manage your database when you've got PostgreSQL 9 Admin Cookbook to hand.</p> <p>PostgreSQL is fast becoming one of the world's most popular server databases with an enviable reputation for performance, stability, and an enormous range of advanced features. PostgreSQL is one of the oldest open source projects, completely free to use and developed by a very diverse worldwide community. Most of all, It Just Works!</p> <p>PostgreSQL 9 Admin Cookbook offers the information you need to manage your live production databases on PostgreSQL. The book contains insights direct from the main author of the PostgreSQL replication and recovery features, and the database architect of the most successful startup using PostgreSQL, Skype.</p> <p>This practical guide gives quick answers to common questions and problems, building on the authors' experience as trainers, users, and core developers of the PostgreSQL database server.</p> <p>Each technical aspect is broken down into short recipes that demonstrate solutions with working code then explain why and how that works. The book is intended to be a desk reference for both new users and technical experts.</p> <p>The book covers all the latest features in PostgreSQL 9. Soon you will be running a smooth database with ease!</p>
Table of Contents (18 chapters)
PostgreSQL 9 Administration Cookbook
Credits
About the Authors
About the Reviewers
Preface
Index

Adding/Removing schemas


Separating groups of objects is a good way of improving administration efficiency. We need to know how to create new schemas and remove schemas that are no longer required.

How to do it...

To add a new schema, issue the following command:

CREATE SCHEMA sharedschema;

If you want that schema to be owned by a particular user, then you can add the following option:

CREATE SCHEMA sharedschema AUTHORIZATION scarlett;

Or, if you want to create a new schema which has the same name as an existing user, so that the user becomes the owner, then try the following:

CREATE SCHEMA AUTHORIZATION scarlett;

In many database systems, the schema name is the same as the owning user. PostgreSQL allows schemas owned by one user to have objects owned by another user within them. That can be especially confusing when you have a schema of the same name as the owning user. To avoid this you should have two types of schema: schemas named the same as the owning user should be limited to just objects...