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Learn PostgreSQL

You're reading from   Learn PostgreSQL Use, manage, and build secure and scalable databases with PostgreSQL 16

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Product type Paperback
Published in Oct 2023
Publisher Packt
ISBN-13 9781837635641
Length 744 pages
Edition 2nd Edition
Languages
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Authors (2):
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Luca Ferrari Luca Ferrari
Author Profile Icon Luca Ferrari
Luca Ferrari
Enrico Pirozzi Enrico Pirozzi
Author Profile Icon Enrico Pirozzi
Enrico Pirozzi
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Table of Contents (22) Chapters Close

Preface 1. Introduction to PostgreSQL 2. Getting to Know Your Cluster FREE CHAPTER 3. Managing Users and Connections 4. Basic Statements 5. Advanced Statements 6. Window Functions 7. Server-Side Programming 8. Triggers and Rules 9. Partitioning 10. Users, Roles, and Database Security 11. Transactions, MVCC, WALs, and Checkpoints 12. Extending the Database – the Extension Ecosystem 13. Query Tuning, Indexes, and Performance Optimization 14. Logging and Auditing 15. Backup and Restore 16. Configuration and Monitoring 17. Physical Replication 18. Logical Replication 19. Useful Tools and Extensions 20. Other Books You May Enjoy
21. Index

Indexes

An index is a data structure that allows faster access to the underlying table so that specific tuples can be found quickly. Here, “quickly” means faster than scanning the whole underlying table and analyzing every single tuple.

PostgreSQL supports different types of indexes, and not all types are optimal for every scenario and workload. In the following sections, you will discover the main types of indexes that PostgreSQL provides, but in any case, you can extend PostgreSQL with your own indexes or indexes provided by extensions.

An index in PostgreSQL can be built on a single column or multiple columns at once; PostgreSQL supports indexes with up to 32 columns.

An index can cover all the data in the underlying table, or can index specific values only – in that case, the index is known as “partial.” For example, you can decide to index only those values of certain columns that you are going to use the most.

An index can also...

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