Book Image

PostgreSQL 10 Administration Cookbook - Fourth Edition

By : Simon Riggs, Gianni Ciolli
Book Image

PostgreSQL 10 Administration Cookbook - Fourth Edition

By: Simon Riggs, Gianni Ciolli

Overview of this book

PostgreSQL is a powerful, open source database management system with an enviable reputation for high performance and stability. With many new features in its arsenal, PostgreSQL 10 allows users to scale up their PostgreSQL infrastructure. This book takes a step-by-step, recipe-based approach to effective PostgreSQL administration. Throughout this book, you will be introduced to these new features such as logical replication, native table partitioning, additional query parallelism, and much more. You will learn how to tackle a variety of problems that are basically the pain points for any database administrator - from creating tables to managing views, from improving performance to securing your database. More importantly, the book pays special attention to topics such as monitoring roles, backup, and recovery of your PostgreSQL 10 database, ensuring high availability, concurrency, and replication. By the end of this book, you will know everything you need to know to be the go-to PostgreSQL expert in your organization.
Table of Contents (14 chapters)

Investigating a psql error

Error messages can sometimes be cryptic, and you may be left wondering why did this error happen at all?

For this purpose, psql recognizes two variables, VERBOSITY and CONTEXT; valid values are terse, default, or verbose for the former, and never, errors, or always for the latter. A more verbose error message will hopefully specify extra detail, and the context information will be included. Here is an example to show the difference:

postgres=# \set VERBOSITY terse
postgres=# \set CONTEXT never
postgres=# select * from missingtable;
ERROR: relation "missingtable" does not exist at character 15

This is quite a simple error, so we don't actually need the extra detail, but it is nevertheless useful for illustrating the extra detail you get when raising verbosity and enabling context information:

postgres=# \set VERBOSITY verbose
postgres=# \set...