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PostgreSQL Administration Cookbook, 9.5/9.6 Edition - Third Edition

You're reading from PostgreSQL Administration Cookbook, 9.5/9.6 Edition - Third Edition

Product type Book

Published in Apr 2017

Publisher

ISBN-13 9781785883187

Pages 556 pages

Edition 3rd Edition

Languages

Concepts

Database Administration

Table of Contents (13) Chapters

Preface

1. First Steps

2. Exploring the Database

3. Configuration

4. Server Control

5. Tables and Data

6. Security

7. Database Administration

8. Monitoring and Diagnosis

9. Regular Maintenance

10. Performance and Concurrency

11. Backup and Recovery

12. Replication and Upgrades

Discovering why a query is not using an index

This recipe explains what to do if you think your query should use an index, yet it does not.

There can be several reasons for this, but most often, the reason is that the optimizer believes that, based on the available distribution statistics, it is cheaper and faster to use a query plan that does not use that specific index.

Getting ready

First, check that your index exists and ensure that the table has been analyzed. If there is any doubt, rerun it to be sure:

postgres=# ANALYZE;
ANALYZE

How to do it...

Force index usage...

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