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PostgreSQL Administration Cookbook, 9.5/9.6 Edition

You're reading from PostgreSQL Administration Cookbook, 9.5/9.6 Edition Effective database management for administrators

Product type Paperback

Published in Apr 2017

Publisher

ISBN-13 9781785883187

Length 556 pages

Edition 3rd Edition

Languages

SQL

Tools

PostgreSQL

Concepts

Database Administration

Authors (4):

Gianni Ciolli

Hannu Krosing

Gabriele Bartolini

Simon Riggs

View More author details

Table of Contents (13) Chapters

Preface

1. First Steps

2. Exploring the Database FREE CHAPTER

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...

The rest of the chapter is locked

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Authors (3)

Simon Riggs

Simon Riggs

Simon Riggs is the CTO of 2ndQuadrant, having contributed to PostgreSQL as a major developer and committer for 14 years. He has written and designed features for replication, performance, BI, management, and security. Under his guidance, 2ndQuadrant is now a leading developer of open source PostgreSQL, serving hundreds of clients in USA, Europe, and worldwide. Simon is a frequent speaker at many conferences on PostgreSQL Futures. He has worked as a database architect for 30 years.

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Bartolini

Bartolini

Gabriele Bartolini is a long-time open source programmer, now head of support at 2ndQuadrant, and an active member of the international PostgreSQL community. Gabriele has a degree in statistics from the University of Florence. His areas of expertise are data mining and data warehousing, and he has worked on web traffic analysis in Australia and Italy. He currently lives in Prato, a small but vibrant city located in the northern part of Tuscany, Italy. His second home is Melbourne, Australia, where he studied at Monash University and worked in the ICT sector. Gabriele's hobbies include playing his Fender Stratocaster electric guitar and "calcio" (football or soccer, depending on which part of the world you come from).

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GIANNI CIOLLI

GIANNI CIOLLI

Gianni Ciolli is the head of professional services at 2ndQuadrant and has been a PostgreSQL consultant, trainer, and speaker at many PostgreSQL conferences in Europe and abroad over the last 10 years. He has a PhD in Mathematics from the University of Florence. He has worked with free and open source software since the 1990s and is active in the community (the Prato Linux User Group and the Italian PostgreSQL Users Group). He lives in London with his son. His other interests include music, drama, poetry, and athletics.

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