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Mastering PostgreSQL 12

You're reading from   Mastering PostgreSQL 12 Advanced techniques to build and administer scalable and reliable PostgreSQL database applications

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Product type Paperback
Published in Nov 2019
Publisher Packt
ISBN-13 9781838988821
Length 470 pages
Edition 3rd Edition
Languages
Concepts
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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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Toc

Table of Contents (18) Chapters Close

Preface 1. Section 1: Basic Overview FREE CHAPTER
2. PostgreSQL 12 Overview 3. Understanding Transactions and Locking 4. Section 2: Advanced Concepts
5. Making Use of Indexes 6. Handling Advanced SQL 7. Log Files and System Statistics 8. Optimizing Queries for Good Performance 9. Writing Stored Procedures 10. Managing PostgreSQL Security 11. Handling Backup and Recovery 12. Making Sense of Backups and Replication 13. Deciding on Useful Extensions 14. Troubleshooting PostgreSQL 15. Migrating to PostgreSQL 16. Assessment 17. Other Books You May Enjoy

Understanding noteworthy error scenarios

After going through the basic guidelines to hunt down the most common issues that you will face in your database, the upcoming sections will discuss some of the most common error scenarios that occur in the PostgreSQL world.

Facing clog corruption

PostgreSQL has a thing called the commit log (now called pg_xact; it was formally known as pg_clog). It tracks the state of every transaction on the system, and helps PostgreSQL determine whether a row can be seen or not. In general, a transaction can be in four states:

#define TRANSACTION_STATUS_IN_PROGRESS    0x00
#define TRANSACTION_STATUS_COMMITTED 0x01
#define TRANSACTION_STATUS_ABORTED 0x02
#define TRANSACTION_STATUS_SUB_COMMITTED...
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