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Mastering PostgreSQL 15

You're reading from   Mastering PostgreSQL 15 Advanced techniques to build and manage scalable, reliable, and fault-tolerant database applications

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Product type Paperback
Published in Jan 2023
Publisher Packt
ISBN-13 9781803248349
Length 522 pages
Edition 5th Edition
Languages
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Author (1):
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Hans-Jürgen Schönig Hans-Jürgen Schönig
Author Profile Icon Hans-Jürgen Schönig
Hans-Jürgen Schönig
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Table of Contents (16) Chapters Close

Preface 1. Chapter 1: PostgreSQL 15 Overview 2. Chapter 2: Understanding Transactions and Locking FREE CHAPTER 3. Chapter 3: Making Use of Indexes 4. Chapter 4: Handling Advanced SQL 5. Chapter 5: Log Files and System Statistics 6. Chapter 6: Optimizing Queries for Good Performance 7. Chapter 7: Writing Stored Procedures 8. Chapter 8: Managing PostgreSQL Security 9. Chapter 9: Handling Backup and Recovery 10. Chapter 10: Making Sense of Backups and Replication 11. Chapter 11: Deciding on Useful Extensions 12. Chapter 12: Troubleshooting PostgreSQL 13. Chapter 13: Migrating to PostgreSQL 14. Index 15. Other Books You May Enjoy

Introducing JIT compilation

JIT compilation has been one of the hot topics in PostgreSQL 11. It has been a major undertaking, and the first results look promising. However, let’s start with the fundamentals: what is JIT compilation all about? When you run a query, PostgreSQL has to figure out a lot of stuff at runtime. When PostgreSQL itself is compiled, it doesn’t know which kind of query you will run next, so it has to be prepared for all kinds of scenarios.

The core is generic, meaning that it can do all kinds of stuff. However, when you are in a query, you just want to execute the current query as fast as possible – not some other random stuff. The point is, at runtime, you know a lot more about what you have to do than at compile time (that is, when PostgreSQL is compiled). That is exactly the point: when JIT compilation is enabled, PostgreSQL will check your query, and if it happens to be time-consuming enough, highly optimized code for your query will...

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