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

Tracking historical CPU usage


In this recipe, we are going to show how to use the sar command in combination with various switches to analyze historical CPU load during some time in the past.

Getting ready

The commands used in this recipe have been performed on a CentOS Linux machine. The command output may vary in other Linux and Unix-based operating systems.

How to do it...

The sar command when used with the -u switch is used to display CPU statistics. When used this way, the sar command will report on the current day's activities.

If we are looking to analyze the CPU statistic over some time period in the past we would need to use the -f switch in conjunction with the -u switch of the sar command. The -f option is followed by the files that sar uses to report on statistics for different days of the month, and these files are usually located in the /var/log/sa directory and usually have a naming convention of sadd, where dd represents the numeric day of the month whose values are in a range...