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Mastering PostgreSQL 9.6

You're reading from Mastering PostgreSQL 9.6

Product type Book

Published in May 2017

Publisher

ISBN-13 9781783555352

Pages 416 pages

Edition 1st Edition

Languages

Concepts

Database Administration

Author (1):

Hans-Jürgen Schönig

Table of Contents (14) Chapters

Preface

1. PostgreSQL Overview

2. Understanding Transactions and Locking

3. Making Use of Indexes

4. Handling Advanced SQL

5. Log Files and System Statistics

6. Optimizing Queries for Good Performance

7. Writing Stored Procedures

8. Managing PostgreSQL Security

9. Handling Backup and Recovery

10. Making Sense of Backups and Replication

11. Deciding on Useful Extensions

12. Troubleshooting PostgreSQL

13. Migrating to PostgreSQL

Understanding execution plans

After digging into some important optimizations implemented into PostgreSQL, I want to shift your attention a bit more to execution plans. You have already seen some plans in this book. However, in order to make full use of plans, it is important to develop a systematic approach to reading this information. Reading plans systematically is exactly within the scope of this section.

Approaching plans systematically

The first thing you have to know is that an EXPLAIN clause can do quite a lot for you and I would highly recommend to make full use of those features.

As many readers might already know, an EXPLAIN ANALYZE clause will execute the query and return the plan including real runtime information. Here is an example:

test=# EXPLAIN...

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Authors (1)

Hans-Jürgen Schönig

Hans-Jürgen Schönig has 20 years' experience with PostgreSQL. He is the CEO of a PostgreSQL consulting and support company called CYBERTEC PostgreSQL International GmbH. It has successfully served countless customers around the globe. Before founding CYBERTEC PostgreSQL International GmbH in 2000, he worked as a database developer at a private research company that focused on the Austrian labor market, where he primarily worked on data mining and forecast models. He has also written several books about PostgreSQL.

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