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

Monitoring CPU load


In this recipe, we are going to use the uptime command to monitor overall CPU load.

How to do it...

The uptime command tells us the following information:

  • Current system time

  • How long the system has been running

  • Number of currently logged on users in the system

  • System load average for the past 1, 5, and 15 minutes

The uptime command can be used as follows:

 bash-3.2$ uptime 
 11:44pm  up 20 day(s), 20 hr(s),  10 users,  load average: 27.80, 30.46, 33.77 

Here in the preceding output we can see the current system time, 11.44pm GMT, and the system has been up and running for the last 20 days and 20 hrs without requiring a reboot. The output also tells us there are around 10 concurrently logged on users in the system. Finally, we also get the load average during the past 1, 5, and 15 minutes as 27.80, 30.46, and 33.77 respectively.

How it works...

The basic purpose of running the uptime command is to have a quick look at the current CPU load in the system. This provides...