Book Image

Mastering PostgreSQL 13 - Fourth Edition

By : Hans-Jürgen Schönig
Book Image

Mastering PostgreSQL 13 - Fourth Edition

By: Hans-Jürgen Schönig

Overview of this book

Thanks to its reliability, robustness, and high performance, PostgreSQL has become one of the most advanced open source databases on the market. This updated fourth edition will help you understand PostgreSQL administration and how to build dynamic database solutions for enterprise apps with the latest release of PostgreSQL, including designing both physical and technical aspects of the system architecture with ease. Starting with an introduction to the new features in PostgreSQL 13, this book will guide you in building efficient and fault-tolerant PostgreSQL apps. You’ll explore advanced PostgreSQL features, such as logical replication, database clusters, performance tuning, advanced indexing, monitoring, and user management, to manage and maintain your database. You’ll then work with the PostgreSQL optimizer, configure PostgreSQL for high speed, and move from Oracle to PostgreSQL. The book also covers transactions, locking, and indexes, and shows you how to improve performance with query optimization. You’ll also focus on how to manage network security and work with backups and replication while exploring useful PostgreSQL extensions that optimize the performance of large databases. By the end of this PostgreSQL book, you’ll be able to get the most out of your database by executing advanced administrative tasks.

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Table of Contents (15 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
1
PostgreSQL 13 Overview
PostgreSQL 13 Overview
What's new in PostgreSQL 13?
Summary
Free Chapter
2
Understanding Transactions and Locking
Understanding Transactions and Locking
Working with PostgreSQL transactions
Understanding basic locking
Making use of FOR SHARE and FOR UPDATE
Understanding transaction isolation levels
Observing deadlocks and similar issues
Utilizing advisory locks
Optimizing storage and managing cleanup
Summary
Questions
3
Making Use of Indexes
Making Use of Indexes
Understanding simple queries and the cost model
Improving speed using clustered tables
Understanding additional B-tree features
Introducing operator classes
Understanding PostgreSQL index types
Achieving better answers with fuzzy searching
Understanding full-text search
Summary
Questions
4
Handling Advanced SQL
Handling Advanced SQL
Introducing grouping sets
Making use of ordered sets
Understanding hypothetical aggregates
Utilizing windowing functions and analytics
Writing your own aggregates
Summary
5
Log Files and System Statistics
Log Files and System Statistics
Gathering runtime statistics
Creating log files
Summary
Questions
6
Optimizing Queries for Good Performance
Optimizing Queries for Good Performance
Learning what the optimizer does
Understanding execution plans
Understanding and fixing joins
Enabling and disabling optimizer settings
Partitioning data
Adjusting parameters for good query performance
Making use of parallel queries
Introducing JIT compilation
Summary
7
Writing Stored Procedures
Writing Stored Procedures
Understanding stored procedure languages
Exploring various stored procedure languages
Improving functions
Using functions for various purposes
Summary
Questions
8
Managing PostgreSQL Security
Managing PostgreSQL Security
Managing network security
Digging into RLS
Inspecting permissions
Reassigning objects and dropping users
Summary
Questions
9
Handling Backup and Recovery
Handling Backup and Recovery
Performing simple dumps
Handling various formats
Replaying backups
Handling global data
Summary
Questions
10
Making Sense of Backups and Replication
Making Sense of Backups and Replication
Understanding the transaction log
Transaction log archiving and recovery
Setting up asynchronous replication
Upgrading to synchronous replication
Making use of replication slots
Making use of the CREATE PUBLICATION and CREATE SUBSCRIPTION commands
Summary
Questions
11
Deciding on Useful Extensions
Deciding on Useful Extensions
Understanding how extensions work
Making use of contrib modules
Other useful extensions
Summary
12
Troubleshooting PostgreSQL
Troubleshooting PostgreSQL
Approaching an unknown database
Inspecting pg_stat_activity
Checking for slow queries
Inspecting the log
Checking for missing indexes
Checking for memory and I/O
Understanding noteworthy error scenarios
Summary
Questions
13
Migrating to PostgreSQL
Migrating to PostgreSQL
Migrating SQL statements to PostgreSQL
Moving from Oracle to PostgreSQL
Summary
14
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Optimizing Queries for Good Performance

In Chapter 5, Log Files and System Statistics, you learned how to read system statistics and how to make use of what PostgreSQL provides. Now that we are armed with this knowledge, this chapter is all about good query performance. Everybody is looking for good query performance. Therefore, it is important to address this topic in an in-depth way.

In this chapter, you will learn about the following topics:

  • Learning what the optimizer does
  • Understanding execution plans
  • Understanding and fixing joins
  • Enabling and disabling optimizer settings
  • Partitioning data
  • Adjusting parameters for good query performance
  • Making use of parallel queries
  • Introducing Just-in-Time (JIT) compilation

By the end of this chapter, we will be able to write better and faster queries. If the queries still aren't very good, we should be able to understand why this...

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