Book Image

MongoDB Cookbook - Second Edition - Second Edition

By : Amol Nayak
Book Image

MongoDB Cookbook - Second Edition - Second Edition

By: Amol Nayak

Overview of this book

MongoDB is a high-performance and feature-rich NoSQL database that forms the backbone of the systems that power many different organizations – it’s easy to see why it’s the most popular NoSQL database on the market. Packed with many features that have become essential for many different types of software professionals and incredibly easy to use, this cookbook contains many solutions to the everyday challenges of MongoDB, as well as guidance on effective techniques to extend your skills and capabilities. This book starts with how to initialize the server in three different modes with various configurations. You will then be introduced to programming language drivers in both Java and Python. A new feature in MongoDB 3 is that you can connect to a single node using Python, set to make MongoDB even more popular with anyone working with Python. You will then learn a range of further topics including advanced query operations, monitoring and backup using MMS, as well as some very useful administration recipes including SCRAM-SHA-1 Authentication. Beyond that, you will also find recipes on cloud deployment, including guidance on how to work with Docker containers alongside MongoDB, integrating the database with Hadoop, and tips for improving developer productivity. Created as both an accessible tutorial and an easy to use resource, on hand whenever you need to solve a problem, MongoDB Cookbook will help you handle everything from administration to automation with MongoDB more effectively than ever before.
Table of Contents (17 chapters)
MongoDB Cookbook Second Edition
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Building tagged replica sets


In Chapter 1, Installing and Starting the Server, we saw how to set up a simple replica in Starting multiple instances as part of a replica set and saw what is the purpose of a replica set. We also have a good deal of explanation on what WriteConcern is in the Appendix of the book and why it is used. What we saw about write concerns is that it offers a minimum level guarantee for a certain write operation. However, with the concept of tags and write concerns, we can define a variety of rules and conditions which must be satisfied before a write operation is deemed successful and a response is sent to the user.

Consider some common use cases such as the following:

  1. Application wants the write operation to be propagated to at least one server in each of its data center. This ensures that in event of a data center shutdown, other data centers will have the data that was written by the application.

  2. If there are no multiple data centers, at least one member of a replica...