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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

Advanced statistics with pg_stat_statements

While the PostgreSQL statistics collector is rich and mature, having to monitor connection activity can be a little tricky since the pg_stat_activity catalog does not provide historical information. For example, as we explained previously, there will be a single tuple with the last executed statement, so no history nor extended details will be provided.

The pg_stat_statements extension solves this problem by providing a single view that gives you a full history of executed statements, timing, and other little details that can come in very handy when doing introspection. Moreover, pg_stat_statements provides a count of how many times the same statement has been executed, resulting in important information that queries might need to pay attention to for optimization purposes.

Several monitoring tools require pg_stat_statements to be installed in order to gather data.

In the following subsections, you will learn how to install this...

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