Book Image

PostgreSQL High Performance Cookbook

By : Chitij Chauhan, Dinesh Kumar
Book Image

PostgreSQL High Performance Cookbook

By: Chitij Chauhan, Dinesh Kumar

Overview of this book

PostgreSQL is one of the most powerful and easy to use database management systems. It has strong support from the community and is being actively developed with a new release every year. PostgreSQL supports the most advanced features included in SQL standards. It also provides NoSQL capabilities and very rich data types and extensions. All of this makes PostgreSQL a very attractive solution in software systems. If you run a database, you want it to perform well and you want to be able to secure it. As the world’s most advanced open source database, PostgreSQL has unique built-in ways to achieve these goals. This book will show you a multitude of ways to enhance your database’s performance and give you insights into measuring and optimizing a PostgreSQL database to achieve better performance. This book is your one-stop guide to elevate your PostgreSQL knowledge to the next level. First, you’ll get familiarized with essential developer/administrator concepts such as load balancing, connection pooling, and distributing connections to multiple nodes. Next, you will explore memory optimization techniques before exploring the security controls offered by PostgreSQL. Then, you will move on to the essential database/server monitoring and replication strategies with PostgreSQL. Finally, you will learn about query processing algorithms.
Table of Contents (19 chapters)
PostgreSQL High Performance Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Disk tuning parameters


In this recipe, we will be discussing a few disk I/O related schedulers that are designed for a specific need.

Getting ready

The Linux kernel provides various device-specific algorithms, which give more flexibility in fine tuning the hardware devices. The Linux kernel by default provides several I/O scheduling algorithms, which have their own unique usages. Kernel also provides a way to change different I/O scheduling policies for different disk devices. The major disk I/O schedulers are CFQ (Completely Fair Queuing), noop, and deadline.

How to do it...

Let us discuss about, the Linux disk scheduling algorithms:

CFQ

This is the default I/O scheduler that we get for the disk devices. This scheduler provides I/O time slices, like the CPU scheduler. This algorithm also considers the I/O priorities by reading the process's ionice values, and also allots scheduling classes such as real time, best effort, and idle classes. An advantage of this scheduler is it tries to analyze...