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Mastering PostgreSQL 9.6

You're reading from Mastering PostgreSQL 9.6 A comprehensive guide for PostgreSQL 9.6 developers and administrators

Product type Paperback

Published in May 2017

Publisher

ISBN-13 9781783555352

Length 416 pages

Edition 1st Edition

Languages

SQL

Tools

PostgreSQL

Concepts

Database Administration

Author (1):

Hans-Jürgen Schönig

View More author details

Table of Contents (20) Chapters

Title Page

Credits

About the Author

About the Reviewer

www.PacktPub.com

Customer Feedback

Preface

1. PostgreSQL Overview FREE CHAPTER

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

Optimizing storage and managing cleanup

Transactions are an integral part of the PostgreSQL system. However, transactions come with a small price tag attached. As already shown in this chapter, it can happen that concurrent users will be presented with different data. Not everybody will get the same data returned by a query. In addition to that, DELETE and UPDATE are not allowed to actually overwrite data as ROLLBACK would not work. If you happen to be in the middle of a large DELETE operation, you cannot be sure whether you will be able to COMMIT or not. In addition to that, data is still visible while you do a DELETE, and sometimes data is even visible once your modification has long since finished.

Consequently, this means that cleanup has to happen asynchronously. A transaction can not clean up its own mess and COMMIT/ROLLBACK might be too early to take care of dead rows.

The solution to the problem is VACUUM:

test=# h VACUUM
Command:     VACUUM
Description: garbage-collect and optionally...

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Authors (1)

Hans-Jürgen Schönig

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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