Book Image

MongoDB Administrator???s Guide

By : Cyrus Dasadia
Book Image

MongoDB Administrator???s Guide

By: Cyrus Dasadia

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. Packed with many features that have become essential for many different types of software professional and incredibly easy to use, this cookbook contains more than 100 recipes to address the everyday challenges of working with MongoDB. Starting with database configuration, you will understand the indexing aspects of MongoDB. The book also includes practical recipes on how you can optimize your database query performance, perform diagnostics, and query debugging. You will also learn how to implement the core administration tasks required for high-availability and scalability, achieved through replica sets and sharding, respectively. You will also implement server security concepts such as authentication, user management, role-based access models, and TLS configuration. You will also learn how to back up and recover your database efficiently and monitor server performance. By the end of this book, you will have all the information you need—along with tips, tricks, and best practices—to implement a high-performance MongoDB solution.
Table of Contents (17 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Introduction


This chapter aims to get you started with MongoDB replica sets. A replica set is essentially a group of MongoDB servers that form a quorum and replicate data across all nodes. Such a setup not only provides a high availability cluster but also allows the distribution of database reads across multiple nodes. A replica consists of a single primary node along with secondary nodes.

The primary node accepts all writes to the database, and each write operation is replicated to the secondary nodes through replication of operation logs, which are also known as oplogs.

A node is determined as primary by way of an election between the nodes in the replica set. Thus, any node within the cluster can become a primary node at any point. It is important to have an odd number of nodes in the replica set to ensure that the election process does not result in a tie. If you choose to have an even number of nodes in the replica set, MongoDB provides a non-resource intensive arbiter server that can...