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

Identifying disk I/O bottlenecks


In this recipe, we are going to use the iostat command to identify disk-related bottlenecks.

How to do it...

There are various options, that is, switches, available with the iostat command. The following are the most important switches used with iostat:

  1. -d: This switch reports the number of kilobytes transferred per second for specific disks, the number of transfers per second, and the average service time in milliseconds. The following is the usage of the iostat -d command:

            bash-3.2$iostat -d 5  5 
     
            sd0            sd2         sd3          sd4 
            Kps tps serv  Kps tps serv Kps tps serv Kps tps serv 
            1   0    53   57  5  145    19 1   89    0   0  14 
            140 14   16   0   0   0    785 31  21    0   0  0 
            8   1    15   0   0   0    814 36  18    0   0  0 
            11  1    82   0   0   26   818 36  19    0   0  0 
            0   0    0    1   0   22   856 37  20    0   0  0 
    ...