Book Image

PostgreSQL 14 Administration Cookbook

By : Simon Riggs, Gianni Ciolli
5 (1)
Book Image

PostgreSQL 14 Administration Cookbook

5 (1)
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 14 allows you to scale up your PostgreSQL infrastructure. With this book, you'll take a step-by-step, recipe-based approach to effective PostgreSQL administration. This book will get you up and running with all the latest features of PostgreSQL 14 while helping you explore the entire database ecosystem. You’ll learn how to tackle a variety of problems and pain points you may face as a database administrator such as creating tables, managing views, improving performance, and securing your database. As you make progress, the book will draw attention to important topics such as monitoring roles, validating backups, regular maintenance, and recovery of your PostgreSQL 14 database. This will help you understand roles, ensuring high availability, concurrency, and replication. Along with updated recipes, this book touches upon important areas like using generated columns, TOAST compression, PostgreSQL on the cloud, and much more. By the end of this PostgreSQL book, you’ll have gained the knowledge you need to manage your PostgreSQL 14 database efficiently, both in the cloud and on-premise.
Table of Contents (14 chapters)

Checking which queries are active or blocked

Here, we will show you how to find out whether a query is running or waiting for another query.

Getting ready

Using the predefined (default) pg_monitor role, you will have full access to monitoring information.

How to do it…

Follow these steps to check if a query is waiting for another query:

  1. Run the following query:
    SELECT datname, usename, wait_event_type, wait_event, backend_type, query
    FROM pg_stat_activity
    WHERE wait_event_type IS NOT NULL
    AND wait_event_type NOT IN ('Activity', 'Client');
  2. You will receive the following output:
    -[ RECORD 1 ]---+-----------------
    datname         | postgres
    usename         | gianni
    wait_event_type | Lock
    wait_event      | relation
    backend_type    | client backend
    query   ...